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Video Game / Sonic Adventure

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Thunder, rain and lightnin', danger, water risin'... ♪

The highest-selling title for the Sega Dreamcast, Sonic Adventure is the first main game in the Sonic the Hedgehog franchise to feature full 3D gameplay. It was released in Japan on December 23rd, 1998, and was localized for North America, Europe and Australia between September-December of 1999.

The game has an increased focus on story, with voice acted cutscenes telling a much more elaborate plot than previous games. Dr. Eggman shatters the Master Emerald and releases an ancient aquatic creature known as Chaos from its confinement. Though Chaos is weak and anemic in its current state, the Doctor aims to obtain the seven Chaos Emeralds to empower it to world-conquering levels. His actions draw the six playable characters to Station Square, where the adventures unfold in a "Rashomon"-Style plot. Completing all of the stories unlocks a seventh, final story that wraps up the loose ends of the overarching plot.


Playable Characters and their gameplay types:

  • Sonic the Hedgehog: A virtuous blue hedgehog capable of running at high speed. Sonic's gameplay style is the most reminiscent of the side-scrolling games: just get to the goal, which is sometimes an animal capsule reminiscent of the Genesis/Mega Drive games and sometimes a Chaos Emerald.
  • Miles "Tails" Prower: A two-tailed fox with an aptitude for building machines almost on par with Eggman's creations. Each stage pits the player against Sonic (and later Eggman) in a race to the goal. His levels are just a single section of Sonic's levels, which Tails must traverse by employing his flying ability.
  • Knuckles the Echidna: Last descendant of an ancient clan and current Guardian of the Master Emerald. When Chaos is released from the Emerald, it is broken into pieces and scattered across the Earth. Without its power, Angel Island falls from its place in the sky and into the Mystic Ruins, and Knuckles takes it upon himself to track down the missing pieces and restore the Emerald. The goal of each stages is to collect three shards, using his Spider-Sense to pinpoint their locations and his sharp knuckles to unearth them.
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  • Amy Rose: A pink hedgehog last seen in Sonic CD, she is mostly defined by her crush on Sonic. Her goal is to protect a bird whom she befriended so she can return it to its family. Amy must outrun ZERO, an implacable robot in pursuit of the bird, and climb a giant balloon which will carry them away. Amy is not very agile, but carries a large mallet which she can use both to defend herself and to pull off acrobatic maneuvers.
  • E-102 "γ" (Gamma): One of Eggman's animal-powered robotic enforcers who, after a chance encounter with Amy, gradually gains self-awareness and turns against his creator. His levels are timed missions with Shoot 'em Up mechanics, with the player being encouraged to destroy chains of enemies to gain additional time.
  • Big the Cat: A slow-witted, lazy, but warm-hearted fisherman. After his pal Froggy swallows a strange-looking jewel and runs away from home, Big trails him to Station Square. The goal of his stages is to fish Froggy out of a body of water.

Sonic Adventure introduced the Chao Races, featuring a clan of mons called the Chao. This mode exists mostly outside the chronology and story of the main game, though winning the races is required for 100% Completion.

Sonic Adventure saw an Updated Re Release for Nintendo GameCube and PC in 2003, dubbed Sonic Adventure DX: Director's Cut. It added special missions and some unlockable games from the Game Gear library. It later became available for purchase on Xbox Live Arcade and PlayStation Network, with the DX: Director's Cut extras sold separately. A similar version popped up on Steam roughly six months later and with the DX version's extra content included. The post-2003 ports are missing the Game Gear spinoffs, unfortunately.

A direct sequel, Sonic Adventure 2, was released in 2001 to commemorate the series' 10th anniversary.


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  • 11th-Hour Superpower: Super Sonic, at the very end.
  • Absurdly Spacious Sewer: Averted with Station Square's sewers, which are a realistic size, but played straight with those of Casinopolis. You get dumped in there if you lose a game of pinball and come away with less than 100 rings or you play the level as Tails.
  • Abusive Parent: Pachacamac didn't have any qualms in ordering his echidna soldiers to trample his own daughter just to get to the Emerald shrine.
  • Action-Hogging Opening: The FMV intro looks far more epic and impressive than most the story depicted in-game.
  • Adaptation-Induced Plot Hole: Speed Highway's downtown section is connected to the town hall in Station Square's adventure field. It is also seen in ruins during the final boss fight. Problem is, DX messed this up by redesigning the building's look on the adventure field.
  • A.I. Is a Crapshoot: Inverted with Gamma. Being one of Dr. Robotnik's creations, his AI was evil by design, but later malfunctioned and turned good.
  • Airborne Aircraft Carrier: The Egg Carrier and the Egg Carrier 2.
  • Air-Vent Passageway: The game actually makes use of this trope a number of times in order to progress from level to level.
    • For example, Sonic and Tails travel through the sewers of Casinopolis in order to find the Chaos Emerald located there.
    • This is also how Gamma and Amy choose to travel through the Hot Shelter in the Egg Carrier.
  • All for Nothing: In the end of Tails' story, Eggman, having lost both Chaos and the Egg Carrier, decides to destroy Station Square by blowing it up with a missile. But to his dismay, it fails to explode. He goes to detonate the warhead, but Tails beats him and disables it. Sadly, in Super Sonic's story, Chaos has obtained the seven Chaos Emeralds and transformed into Perfect Chaos, causing Station Square to be completely inundated and destroyed anyways. That said, the people of the city are still grateful to Tails for his actions, as seen in Sonic Adventure 2.
  • All There in the Manual:
    • According to an official Sonic website, ZERO is the "zeroth" E-Series robot with the official designation of E-100 Alpha.
    • Said website also reveals that Chaos is a mutant Chao.
    • One of the game's official strategy guides gives names and E-Series numbers to all of the game's badniks. Said guide also explains a little more of the ancient echidna tribe's backstory, such as Pachacamac's warmongering being pivoted by the death of his mother (Tikal's grandmother).
  • All Is Well That Ends Well: At the end of the game, as the characters are recuperating after their battle against Perfect Chaos, Tails invokes this trope verbatim in the English dub, despite the fact that the city has been completely inundated and destroyed.
  • Almost Out of Oxygen: A staple of the franchise. That countdown music is unnerving.
  • Already Done for You: Given that the storylines (apart from the Super Sonic storyline) are done in a "Rashomon"-Style, expect this to happen very often. For example, Sonic can only enter Speed Highway by getting the employee key card to unlock the elevator. When Tails goes to Speed Highway in his own story, the elevator is already unlocked.
  • Amusement Park: Twinkle Park, which serves as Sonic's fifth action stage and Amy and Big's first. Sonic's section starts out with him driving a bumper car through a race course, then search for the end-of-level capsule at the top of Pleasure Castle, which includes a roller coaster, a bowling minigame, and obstacles with an amusement park backdrop. Amy's section has her go inside Pleasure Castle, where she must evade ZERO through the hall of mirrors, while Big's section has him fish for Froggy in the pool near Pleasure Castle.
  • Anachronic Order:
    • Because of the "Rashomon"-Style nature of the story, the sequences where the characters see Tikal in the past are not played in order so it's up to the player to piece together what went down between Tikal and the Chao, her father and his tribesmen, and what prompted Chaos's vengeance. This video attempts to show the sequence of events that led up to Chaos being unleashed.
    • In a downplayed variant, the characters' actual stories don't begin or end at the same time. However, this is only visible if you pay attention to the NPC subplots. The most obvious tell is the lady who has a crush on a burger shop employee, but is too shy to tell him; how far away she is from the burger shop indicates how far into the story you are. Through this, it's apparent that Sonic and Tails' stories start earlier than the other characters, while Amy's story ends last, as it's the only one where the burger shop subplot is resolved (the lady gets a job working at the burger shop).
  • And the Adventure Continues: Invoked by Sonic during the Previously on… segment at the start of the Last Story; apparently he's in the habit of heading off on new journeys once the bad guys are beaten. For everyone else, this is an example of But Now I Must Go.
  • And Then What?: When Tikal declares that Perfect Chaos must be resealed within the Master Emerald, Sonic asks her this. He points out that Chaos will still be a ball of rage trapped by his own emotions, with the unspoken point that if he were freed again, he'd just go on another rampage. Tikal replies that they don't have any other options, until the other heroes provide one by bringing in the discarded Chaos Emeralds.
  • And Your Reward Is Clothes: In DX, getting all medals unlocks Metal Sonic, who is essentially a reskinned Sonic with slightly altered animations. You can only use him in Trial mode.
  • Animated Adaptation: The whole game was adapted into an arc in The Anime of the Game Sonic X, as was its sequel.
  • Another Side, Another Story: Play through the main story from 6 different perspectives. Each character also gets a piece of the backstory of Chaos and the echidna race, only by playing through all stories do you get the complete sequence. And, at least in the English dub, each story's dialogue subtly differs "Rashomon"-Style to reflect the viewpoint of the player character.
  • Anti-Frustration Features:
    • The spirit of Tikal is often in the overworlds, giving you hints on where to go next if you touch it.
    • At certain points in Adventure Mode, the loudspeaker will announce "There are no trains in service at this time", which helpfully prevents wasting time running to the train.
    • In Sonic's Icecap the timer stops counting up until the player finishes the short cutscene with Sonic getting on the snowboard, this way the player's timescore isn't affected while they are not in control of Sonic.
    • In mission mode all of the missions are color coded on the mission screen to indicate which characters have access to certain missions.
  • Apocalypse How: The destruction of the echidna civilization 3,000 years ago is a Class 1. Then Chaos' destruction of Station Square is a Class 0, since the citizens likely evacuated and survived.
  • Armed with Canon: The localization team pokes fun at the "Robotnik" name debate just before the Egg Hornet battle. Dr. Robotnik throws a tantrum and insists on being addressed by his real name; everyone just ignores him and continues calling him Eggman.
  • Art Evolution:
    • This game introduced the "modern" art style for Sonic and his friends that would be used in future games. Amy was the one affected most by this, as she no longer looks like a pink Sonic in drag. However, the Sonic-themed pinball table in Sonic's version of Casinopolis does feature stock artwork from the earlier games.
    • Angel Island is noticeably redesigned from its Classic Era counterpart in Sonic 3 & Knuckles. Here is the original, contrasted to this game's counterpart.
  • Artificial Stupidity:
    • Tails' levels have you race against Sonic, who is technically another player controlled by an AI. Because of this, Sonic tends to struggle when dealing with obstacles (which is particularly notable at the end of Casinopolis, where he takes a very long time just to jump through a bunch of spikes), but he makes up for this by rubber-banding his way to the goal. The last race against Eggman averts this because he's not an AI at all, instead he just follows a straight path to the goal.
    • The fights against the other playable characters in the game (such as Sonic vs. Knuckles) aren't much better, as they simply charge at you and don't bother dodging your attacks. Because of this, each fight will usually last under twenty seconds.
  • Ascended Extra: Amy, originally a semi-recurring side character beforehand, gained a prominent playable role in this and many titles following it.
  • Autobots, Rock Out!: The first example of the series. Sonic, upon harnessing the remaining positive energy within the Chaos Emeralds, transforms into Super Sonic and the main riff of "Open Your Heart" sets the scene. The theme also continues into the battle proper, providing the music for the first half of the fight.
  • Back for the Finale: Though Gamma is gone by the end of his story, the pink Flicky that was powering him shows up to represent him during Super Sonic's story.
  • Balloonacy: A single balloon is all Amy needs to float away from ZERO's grasp.
  • Bare Your Midriff: Tikal wears a tank top that exposes her torso.
  • Battle in the Rain: Sonic's first encounter with Chaos 0 takes place during a stormy night.
  • Big Bad: Eggman, of course. Or so it seems. Chaos ends up being the main antagonist once the last story rolls around, though he's not evil so much as a vengeful Tragic Monster.
  • Big Fancy Castle: Pleasure Castle serves as the centerpiece of Twinkle Park. Sonic's section has him climb atop it to look for the end-of-level capsule, while Amy's section has her go inside it to evade ZERO in the hall of mirrors.
  • Bigger on the Inside: The Hot Shelter and Sky Deck suggests that the Egg Carrier is this.
  • Big "NO!": Pachacamac yells "No!" after his conquest invites the wrath of a furious Emerald-powered Chaos onto his tribe.
  • Bittersweet Ending:
    • In Knuckles' story, he has finally recovered all of the pieces of the Master Emerald and successfully reassembled it. However, he's still bound to his mission to guard the emerald alone. He concludes that, while he's unsure why he was given this duty, he will continue to do it anyway.
    • In Gamma's story, Gamma dies after destroying his brothers to free the Flickies, but a Flicky of his own is free as well, setting up the ending in Amy's story.
    • In the final story, Chaos is neutralized, but Station Square is a flooded mess. It's rebuilt in the Sonic X adaptation, while in Sonic Chronicles, it's nothing more than a tumble-down shanty town in which the survivors live, located in Blue Ridge Zone.
  • Blob Monster: Chaos, who's made of water.
  • Body Horror: The way the scene of Gamma finding Beta being rebuilt following the training exercise at the beginning of Gamma's story plays out. Gamma's reaction is flatly neutral due to his monotone voice and lack of a face but the experience itself is designed to evoke a sense of Beta undergoing an unwanted transformation from the point of view of the player.
  • Bond Villain Stupidity: Early in both Sonic and Tails' stories, following Casinopolis, Eggman successfully ambushes them, sleep gassing them, and stealing their recently acquired Chaos Emerald. Rather than simply using a lethal gas to begin with, or killing them immediately afterwards, he leaves them alone to wake up unharmed the next morning.
  • Bookends:
    • Knuckles' story begins and ends with him narrating how he was fated to stay forever on Angel Island guarding the Master Emerald. In the beginning, he mentions that he doesn't know why he was given this role in life, but in the end, he suggests he may be better off not knowing.
    • The game begins and ends with Sonic fighting Chaos. The first time, he fights Chaos 0. In the last story, he fights Perfect Chaos.
  • Born-Again Immortality: The Chao can come back from death this way if raised correctly. In fact, dying and being reborn twice is one of the requirements for a Chao to become a perfectly immortal Chaos Chao.
  • Boss Arena Idiocy:
    • The arena Amy fights ZERO in is enclosed by an electric fence. If you knock ZERO into the fence, it will reveal a button in its head. Hitting this button damages and ultimately self destructs it.
    • Knuckles would not have defeated Chaos 6 if it weren't for the ice robots scattered all over the arena (for Sonic's fight with Chaos 6, see Tactical Suicide Boss below).
  • Boss Arena Urgency: After the Egg Viper takes five hits, Eggman will start to destroy the platforms you're standing on. If you don't finish him quick, you'll have nothing left to stand on and plummet to your death.
  • Boss Rush: Beating a story unlocks a mini-game where you fight each of the bosses faced in that story one after the other (the exception being Super Sonic, whose story only consists of a single boss fight with some Adventure Field navigation beforehand). Gamma's version is strangely restricted to only the Adventure Field battles against E-101 Beta and E-101 Mark II, lacking any of his in-level bosses.
  • Boss-Only Level:
    • Outside of the three E-Series robots not named 101 in Gamma's story, all the boss fights and character duels are self-contained on the main adventure fields (though the last boss fights for Sonic and Tails start right after the player completes their final action stages, but are not directly connected to those stages outside of terrain).
    • The final storyline is consists of a single boss fight, Perfect Chaos, strung together by cutscenes and some minor Adventure Field gameplay. Infamously, grabbing the Crystal Ring powerup in this story is a Game-Breaking Bug if you quit and reload without beating an Action Stage first, since the game doesn't know where to load from otherwise.
  • Boss Subtitles: In the style of a typewriter.
  • Boss Tease:
    • Amy Rose's story and gameplay consists of being hunted by, and running away from, E-100 ZERO, a robot specifically designed to end your run and capture the small bird you're carrying. While you can temporarily slow it down in action stages, you can only really defeat it in your final encounter. Justified in that Amy can't access the tough robot's weakpoint without the electrified fences in the boss arena.
    • E-102 Gamma's story will, at one point, lead you into a cutscene wherein your "big brother", E-101 Beta, is being rebuilt in a funky new form, in what probably registers as robotic Body Horror for poor Gamma and Beta. E-101 Beta Mk.II is the last boss for Gamma, to be fought much later.
  • Bowdlerize: In the international versions, there is a rather innocuous billboard in Casinopolis. In the original Japanese version, this billboard was of a scantily-clad cowgirl with a fully modeled martini glass... that moaned suggestively when jumped or glided into.
  • Broken Bridge: Parts of the Mystic Ruins, including Angel Island itself, are blocked off by pedestals that require magic stones. The same goes for Station Square, except that the keys are more mundane. Also, after the Tornado crashes, Sonic (who landed in Station Square) and Tails (who landed in the Mystic Ruins) can't reunite because the train isn't running since the workers have gone on strike, with striking workers standing outside the station in Station Square (all of the characters except Big get to deal with the strike blocking access to or from Station Square). And lastly, if the player exits Tails' last Action Stage before completing itnote , the trains will not be operating for some reason even though there is a missile crisis going on.
  • Broken Record: Get used to hearing Eggman say "Get a load of this!" a lot during final battles against the Egg Viper and the Egg Walker at the end of Sonic and Tails' respective storylines.
  • But Now I Must Go:
    • According to the Previously on… segment at the start of the Last Story, Sonic was planning to head out on his next journey after his nap, since Eggman appeared to have been defeated. His plans were interrupted once Tikal found him.
    • After the defeat of the True Final Boss, both Tikal and Chaos Ascend to a Higher Plane of Existence at the end of the story, while Sonic goes running off. Notably, Station Square is still in ruins when this happens.
  • Call-Back:
    • Icecap first appeared as "IceCap Zone" in Sonic the Hedgehog 3, and it featured a snowboarding segment, too. Red Mountain's inner section is also clearly part of Lava Reef from Sonic & Knuckles. Both are set on Angel Island.
    • After the Sky Chase minigame, Tails has a flashback to his first meeting with Sonic, originally narrated in the Japanese Sonic the Hedgehog 2 manual.
    • Amy Rose has a flashback to her kidnapping in Sonic the Hedgehog CD.
    • The ending to Sonic's story mode is more or less a 3D tribute to the ending of Sonic the Hedgehog, complete with Sonic's "YEAH!" Shot into the camera.
    • The cutscene right after the player beats Red Mountain during Sonic's story seems to be a call-back to the cutscene before the final level in Sonic the Hedgehog 2.
  • The Cameo:
    • NiGHTS, from NiGHTS into Dreams…, has their own pinball board in Casinopolis and will even appear in person sometimes.
    • Metal Sonic and Mecha Sonic appear in stasis tubes at Eggman's Mystic Ruins base.
    • Tails Doll, along with doll versions of Knuckles and Sonic, appear as training dummies in Gamma's first level and Sonic's tenth and final level.
    • In the DX version, Cream the Rabbit appears at certain points in the Adventure Field (only in Station Square), and Chris Thorndyke from Sonic X appears as a billboard in certain missions.
  • Cannot Spit It Out: A Shrinking Violet in Station Square has a major crush on the guy who works the counter at the Burger Shop. She can't muster up the courage to tell him how she feels, so, she ends up hanging around the shop all day, not saying anything. From his vantage point, she's a Stalker with a Crush. Towards the end of the entire game's storyline, she figures out a way to overcome her problem: get a job at the Burger Shop alongside her object of affection.
  • Captain Obvious: Quite a few snarky moments if you look closely.
    (the Egg Carrier changes its shape)
    Tails: Ahhh, wow! It's changed shape. Did you see that?
    (Sonic gives him a weary look, and ignores him)
    Sonic: Darn! This makes it harder for us to get to the bridge!
    Tails: I hate it when he doesn't listen...
    • Also, Gamma, due to being a robot. He states:
    Gamma (when transported into the past via a vision): "This presents a problem."
    Gamma (after seeing what happened to Beta after defeating him at the beginning): "This is the wrong room."
  • Casino Park: Casinopolis, which serves as Sonic's third action stage and Tails and Knuckles' second. In Sonic's section, Sonic has to play the games to earn at least 400 rings to deposit into the safe to get the White Chaos Emerald at the top. Losing a pinball game with less than 100 rings will send him into the sewers, where he must find his way out, which forms the entirety of Tails' section. Knuckles' section has him search for the pieces of the Master Emerald in the lobby.
  • Cerebus Syndrome: The game has a darker, more shonen-anime esque tone than its predecessors. The real antagonist, Chaos, isn't a standard "take over the world" bad guy, but a vengeful, mourning creature of god-like power who wiped out an entire civilization (and this is also the first game in the series where characters are explicitly killed, albeit off-screen) and is stated to have come very close to causing an apocalyptic scenario. The stakes are raised much higher here than in any of the previous entries.
  • Character Development:
    • Tails learns to take on troubles without Sonic's help, and he even musters up the courage to stop Eggman's attack on Station Square.
    • Knuckles, who starts the story wondering why he was tasked with guarding the Master Emerald, accepts his duty after learning more about his echidna ancestors.
    • Amy goes from being a Damsel in Distress depending on Sonic to save her to an Action Girl beating up the very robot that constantly pursued her.
    • Gamma learns about love and caring, which motivates him to stop being a mindless servant to Eggman, go on his own mission, and eventually has to die to free the bird trapped inside of him.
  • Characterization Marches On: This game marks the first time Knuckles is portrayed as stoic and serious in contrast to his debut in Sonic 3 & Knuckles where he was constantly laughing at you when he activated one of his traps.
    "Unlike Sonic, I don't chuckle. I'd rather flex my muscles!"
    —"Unknown From M.E.", theme of Knuckles
  • Chekhov's Gun: The Chaos Emerald inside the Tornado 2. It plays a major role in setting off the events for the Super Sonic chapter.
  • Chekhov's Gunman: Retroactively. Metal Sonic appears in Amy's story in a flashback of Sonic CD, and as a Easter Egg inside Eggman's base in Mystic Ruins. He would return as the Big Bad in Sonic Heroes.
  • Child Prodigy: Tails was implied to have this in previous games, but this is probably the first major series game note which shows the full extent of his technical skills, such as his mechanically powered house and his transforming airplane.
  • Climax Boss: Several for different character modes, mostly aligned to their Character Development:
    • The Egg Walker is the Final Boss of Tails' story, culminating in him developing independence from Sonic and stopping Eggman on his own.
    • The Sonic/Tails vs. Gamma boss. While pathetically easy whoever you play as, it occurs just after Gamma's Pet the Dog moment releasing Amy from an unknowing Eggman, leading Amy to break up the fight and provoke his Heel–Face Turn.
    • Also E-101 Beta Mk II, Gamma's Final Boss, happening straight after Gamma establishes its Foregone Conclusion that it will sacrifice itself to complete its E-Series rescue mission.
  • Color-Coded Characters: As shown on the character select screen, each character's menu items are shown in a different color:
    • Sonic - Blue
    • Tails - Orange
    • Knuckles - Red
    • Amy - Pink
    • Big - Purple
    • Gamma - Gray
    • Super Sonic - Yellow
  • Comic-Book Adaptation: Was adapted in story arcs in Sonic the Hedgehog (Archie Comics) and also as what was notably the last new story arc in Sonic the Comic.
  • The Computer Is a Cheating Bastard: Present in Tails' stages, specifically of the Rubber-Band A.I. variety.
    • More infamous is Chaclon/Chacron, a Chao that shows up in the Chao Races upon their completion. What makes him a cheater is that he's constantly in the "boost" state and runs right past the tree he's supposed to shake. He graciously gives the competition a head start, but once that time is up, he'll burst right out of the gate.
  • Conflict Ball: Knuckles' fight with Sonic relies heavily on Contrived Coincidence and Poor Communication Kills, what with Knuckles immediately attacking and demanding the Master Emerald shards after catching a mere glimpse of the green Chaos Emerald that Sonic is actually holding.
  • Console Cameo: E105ζ (E-105 Zeta) is made of six Dreamcasts located around the grey blocks under his cannons.
  • Continuity Nod:
    • There's this line:
      Sonic (to Knuckles): "Did Eggman trick you again?"
    • One of Amy's memories is of Sonic saving her in Sonic the Hedgehog CD. However, the models weren't changed.
    • When playing other characters' stories, your allies will sport any power-up accessories you picked up for them in their stories (although this can also create a Continuity Snarl since you'll see characters with upgrades at points before they received them in their own stories, such as Sonic wearing the Light Speed Shoes when he comes to rescue Tails in Emerald Coast).
    • After getting their powers drained by Perfect Chaos, the Chaos Emeralds look the same as the Super Emeralds did in Sonic 3 & Knuckles in their powerless state (except for the size, of course), prior to being fully restored by the player.
    • Tails has a dream reminiscing his first meeting with Sonic, as previously told in the Japanese manual of Sonic the Hedgehog 2.
    • In the Japanese version, a random NPC makes reference to Sonic's prior adventures in Little Planet and Angel Island.
    • Amy wields the Piko Piko Hammer, which she was first seen with in Sonic the Fighters. As a nod to this, one of its upgrades is called the Warrior Feather ("Fighters Feather", in the original Japanese release).
    • Another thing that would have been lost to most non-Japanese players is that the game's story makes major references to a number of lore details mentioned in the classic games' Japanese manuals. For instance, the background with an ancient prosperous civilization attempting to misuse the Chaos Emeralds before being wiped out overnight for their actions was first narrated in the Japanese manuals of Sonic 2 and Sonic 3. Similarly, Chaos and his dragon-shaped ultimate form are a reference to the story prologue from the Japanese Sonic 3 manual, which mentions an ancient mural predicting the forthcoming of a legendary dragon that would bring disaster after coming out of an egg.note  A similar mural is seen in Lost World.
  • Contrived Coincidence: Eggman lies to Knuckles that Sonic is collecting the pieces of the Master Emerald, but what really causes Knuckles to seize the Conflict Ball is seeing Sonic at an angle that just so happens to partially expose the green Chaos Emerald to Knuckles' eyes.
  • Convection Schmonvection: Sonic and Gamma can survive just fine in the incredibly hot volcano section of Red Mountain, with lava and geysers being the only hazards that damage them. Then again, this is true of all Sonic games where the characters don't suffer any ill effects from standing only a few inches above a lava pit.
  • Crazy-Prepared: Eggman. Not only does he have the God of Destruction at his command, he has a giant flying carrier (although it functions more like a battleship), a second carrier to use against Chaos if it goes rogue, a huge missile stationed off the coast of Station Square should the Egg Carrier and Chaos be defeated, and a giant base in the middle of Mystic Ruins. All of this raises the question, however, of why he needs to gamble with controlling the God of Destruction to destroy just one city with all of these fairly potent back-up plans.
  • Creature-Breeding Mechanic: Both games include Chao gardens. Chao may be trained and any two may be crossed, with the usual Lamarckian mechanics coming into play. This doesn't affect anything outside of the garden, though.
  • Critical Existence Failure: As in most games in the franchise, Sonic and the cast can take any amount of damage, from a barrage of Eggman's launched missiles to an explosion a third the size of the Egg Carrier, without any outward sign of injury, but after their last ring is lost, brushing against a robot chimp is enough for a K.O.
  • Crystal Prison: The Master Emerald is this to Chaos.
  • Cue the Sun: The end of Speed Highway. Its BGM is appropriately called "At Dawn."
  • Curb-Stomp Battle:
    • In the final route of the game, Eggman hops into the Egg Carrier 2 to tame Perfect Chaos. It's on-screen for maybe ten seconds before Perfect Chaos blows it up.
    • The Sonic/Tails vs. Gamma battles usually play the outcome as such, depending on which character is playing. In Amy's case, Sonic is winning, but with Gamma still holding ground.
  • Cutscene Incompetence: Many cutscenes, due to the generally stilted choreography. Sonic in particular seems to forget how to run and ends up walking to close distance when he needs to run to prevent something bad from happening.
  • Cutscene Power to the Max:
    • Now we know why Sonic refuses to sit in the cockpit of Tails' plane — because gravity means nothing to him. He survives falling several kilometers to the ground not once, but twice in the game. The second time, Sonic's body endures a comical pancake effect when he hits the ground, but he's no worse for wear.
    • In Tails' ending, he manages to fly all the way from Station Square to the Mystic Ruins without getting tired.
  • Darker and Edgier:
    • Especially compared to most Sonic games released before it. It's nothing compared to, say, Sonic Adventure 2 or Shadow the Hedgehog, but this game literally starts off with an opening FMV depicting a city being flooded, and later in the game, we see the echidna tribe kill the Chao, before being wiped out themselves.
    • Gamma's story is this to the rest of the game, complete with an explicitly Bittersweet Ending. Super Sonic's story has a somewhat grimmer tone than the rest of the game as well, in which the destruction of Station Square foreshadowed by the aforementioned cutscene takes place.
    • Eggman also plays a more No-Nonsense Nemesis role in this, relying on cunning to collect the Chaos Emeralds and generally not putting on more of a show than necessary. By the end of Tails' story, he's also very agitated and ready to kill anyone who gets in his way without mincing words (this carries over into the end of Sonic's story, which takes place afterwards, where he's in no mood to put up with Sonic's 'tude).
  • A Day in the Limelight: Tails, Knuckles, and Amy, who are generally supporting characters in Sonic's adventures, all have their own campaigns here that greatly flesh out their characters. Particularly noticeable with Amy since she was mostly relegated to cameos in spin-off titles prior to this game. This game also marks the first time you play a character from Eggman's perspective, as Gamma starts off as a part of his crew before defecting.
  • Deadly Rotary Fan: Spinner and Thunder Spinner are fitted with these. Speed Highway also features a Helicopter Blender obstacle.
  • Deconstructed Trope: E-102 Gamma's storyline is an unexpected deconstruction of Eggman's robotic mooks... or more specifically, the fact that Eggman's robots are powered by animals. (Well, technically, Gamma was an Elite Mook, but whatever.) After seeing Amy's flicky in the Egg Carrier's prison chamber, his power source's memories and emotions began to conflict with his programming, eventually leading to his seeking out and destroying the other E-100 models (and himself) to free the animals inside.
  • Denser and Wackier: Big's story is much more offbeat and lighthearted compared to most of the other character modes.
  • Department of Redundancy Department: The stage tracks for both Adventure games have a naming convention where they list the track name "...for [Stage Name]". This leads to redundancies such as "Run Through the Speed Highway ...for Speed Highway" or "Sky Deck A Go! Go! ...for Sky Deck."
  • Developers' Foresight:
    • If you're thinking bringing a bunch of rings into Casinopolis from the adventure field (probably for an instant emblem), don't bother. The game will just reset your ring count to zero.
    • In general, this game averts Welcome to Corneria. Every major story event leads to new dialogue from the NPCs, who usually comment on recent story developments. Head back to Station Square as Amy between escaping the Egg Carrier and going to Final Egg, and there will be fewer NPCs, with a good deal of the remaining ones talking about the missile that Eggman launched at the city. The train strike has even stopped to help with evacuation.
    • Big's adventure stages have distinctly little to do with speed relative to those of the other playable characters, so they aren't timed and he doesn't have the traditional checkpoint goalposts. Instead, the weight of the largest fish Big catches is recorded and retained in the event that Big dies or his fishing line breaks.
    • Even though there is little opportunity to drown in this game, and the odds of it happening are long to match, the production team went ahead and included drowning animations and vocal effects for all of the playable characters except for Gamma, in addition to bringing the classic drowning music up to full orchestral caliber.
      • Gamma can't go into water, because he'd short out and break if he did. Instead, he compresses his body and deploys a propeller so he can hover over water. It makes caring for Chao more difficult.
  • Dig Attack: Knuckles can dig underground once he finds the shovel claws upgrade. This is mostly used to find Master Emerald pieces that are buried underground, starting with Red Mountain (the first Knuckles action stage played after Knuckles obtains the claws) note . Sonic Battle takes this one step further by having Knuckles' burrow ability as a special move, in which after he goes underground, he can move under an enemy and pop up from below to his or her surprise.
  • Didn't Think This Through: Tails modifies his plane so he and Sonic can fly up to the Egg Carrier. This seems to go smoothly until Tails realizes he forgot to equip landing gear just as they're about to land the plane.
  • A Dog Named "Dog": Big isn't too creative with the names, as his frog friend is named Froggy.
  • Doing In the Wizard: In-game, Chaos is consistently portrayed as being some kind of genuine deity that the echidnas worshiped, and having some unexplained connection to the Chaos Emeralds and the Chao — where exactly he came from is never explained in the story. Out of universe, Sonic Channel's profile of the character claims that he is just a Chao mutated by the energy of the Chaos Emeralds.
  • Double Knockout:
    • This happens after the Sonic (or Tails) vs. Knuckles fight, both characters run up to each other to attack, only to knock each other to the ground, followed with Sonic or Tails dropping the two Chaos Emeralds, which are then immediately taken by Eggman and fed to Chaos (this creates Chaos 4; the vs Knuckles fight on all sides goes directly to the Chaos 4 boss fight).
    • This can happen in the end of the Egg Viper boss battle, in which it specifically tries to take Sonic down with it.
  • Downloadable Content:
    • Sega released a lot of this, which a player could download onto their VMUs (Visual Memory Unit). You could celebrate Christmas or the year 2000, in addition to the launch of the Dreamcast in the United States, or try to win sportswear from Reebok. A Game Mod for the 2004 PC version ported all the DLC and also provided translations for the non-English packs.
      • Of note is the Japanese "Kadomatsu '99"note  DLC, which was thought to have been lost due to no one preserving the save files. However over twenty years later it was retrieved thanks to a random purchase of an old memory unit. It has since been integrated into the above-mentioned mod for the PC version.
      • The maker of the PC mod also released his own custom DLC pack. This can be played on a real Dreamcast or in the PC's DLC mod.
    • In the Xbox 360 and PlayStation 3 ports, the unlockable Metal Sonic and Mission Mode from DX needs to be bought separately. Averted with retail PC and later Steam versions which kept the DX version's content.
  • The Dragon: Chaos to Eggman. If just to get the Emeralds. Gamma's role in preserving him and helping against the heroes prior to a Heel–Face Turn may apply them as Co-Dragons.
  • Dragon with an Agenda: Chaos only helps Eggman to get the Emeralds so that Chaos can go One-Winged Angel and destroy the world.
  • Dream Sequence: The visions of the echidnas' ancient history work as this.
  • Dreary Half-Lidded Eyes: Some Chao that can have this as a default expression, but most notably Chacron. Players might think they're in for an easy race because of his sleepy look (even giving the other Chao a head start in the first game while he just lies down) before suddenly jolting past absolutely everyone.
  • Dub-Induced Plot Hole:
    • The game's story expands on elements from the Japanese manuals of the Mega Drive game, including an ancient tribe guarding the Chaos Emeralds and a dragon fated to destroy the world. Due to other countries replacing these plot points with their own, this led to confusion from these countries of the new direction.
    • The English translation establishes that "Eggman" is a mocking nickname Sonic gave Dr. Robotnik, while he was always named "Dr. Eggman" in Japan. This raises the question of why he would make "EGGMAN" the password to the Egg Carrier Chao Garden.
    • If you go to the Angel Island section of Mystic Ruins as Sonic and stay still for a while, he'll say "So this is Angel Island", as if he had never been to the place before. In the Japanese original, his line was "Isn't this Angel Island?" instead, indicating that he was recognizing the place.
    • Most infamously, Tails declares "All is well that ends well" at the end, ignoring the fact Perfect Chaos just destroyed the city. In the Japanese version, he just expressed relief that Perfect Chaos had been stopped.
    • In the cutscene before the Egg Viper, Eggman sounds strangely nonchalant and confident considering that the last time we saw him he had snapped following the destruction of the Egg Carrier and defeat of Chaos 6, leading to him trying to nuke Station Square with himself in it — and even that was foiled, by Tails of all people. This was another weird dub change; the Japanese original had him acting more desperate and on the edge. This also explains his wild mannerisms in that scene.
  • Dub Name Change:
    • Not unlike Super Mario 64, this game marks the transition from a dub name to the original name and does so by using both, in this case Dr. Robotnik and Dr. Eggman.
    • Outside of the obvious turning point for the series villain, a few minor elements were renamed when the game went International, such as Mystic Ruin to Mystic Ruins and Spina to Spinner.
    • Two of the upgrades had their names changed — Rhythm Brooch became Rhythm Badge and Fighters Feather became Warrior Feather (though its Japanese name, "Senshi no Hane", is a more-or-less literal translation). All the others have the same (English) name in both versions of the game.
  • Dub Personality Change:
    • Eggman and Sonic's first interaction changes between the original Japanese and the English translation. In the original Japanese, Eggman greets Sonic in an amicable way as Sonic remains cautious. In the English dub, Sonic mocks Eggman by telling Tails "look, a giant walking egg", to which Eggman angrily responds "Silence! I am Doctor Robotnik!", seemingly to justify the name of Eggman in western territories.
    • The dub gives Sonic Totally Radical dialogue and has him address his opponents by insults and nicknames, making him come off somewhat more hyper and childish. The original Japanese script had him use the occasional Gratuitous English instead, and gave him a more cool and composed demeanor, acting more nonchalantly in front of his enemies. In addition, some of the nuance and quirks of his original dialogue and demeanor were downplayed or Lost in Translation.
  • Dueling Player Characters: The game has Sonic and Knuckles fight again, and he also duels with Gamma. However, playing through as Knuckles and Gamma allows the player to fight Sonic, and playing as Tails puts him in these fights instead of Sonic.
  • Dull Surprise:
    • Due to the technical limitations of 3D modeling from back then, the cutscenes depict the characters with very blank or basic expressions and rigid to nonexistent body language — many cutscenes just have the characters standing in idle, neutral poses while talking. It's somewhat jarring compared to the elaborately choreographed cutscenes seen in later games.
    • The English voice acting can also be like this, such as Knuckles' absolutely apathetic "oh no" whenever Sonic hits him during their fight. (It was clipped out of context from a beta cutscene, for some reason.) Gamma has this completely intentionally, though. Then there's the scene where Tails is about to crash his plane near Sonic at the beginning of Sonic's story, and Sonic reacts to it very dully.
  • Early Installment Weirdness:
    • Sonic Adventure's A-Life system differs significantly to all the other versions used from Sonic Adventure 2 onward. Neutral Chao were the only ones available in the game, and normal color baby Chao used the blue and green coloration of the Neutral/Normal evolutions instead of their usual blue and yellow, though the ones in the cutscenes had this. Coconuts grew at an insane rate compared to the ones in Sonic Adventure 2 and even the DX version, feeding them increased a Chao's tiredness and boosted their max HP (a stat not present in any other game with Chao) and falling coconuts could hurt them. While throwing a Chao will only upset them, attacking them causes them to lose HP, and they will die their HP reaches zero — even the immortal Chaos Chao — in the original Dreamcast release. Chao sounded and behaved quite differently, and used animal trait actions much more often, while the changes that took place during second evolution happened to be absolutely insane and often broke their models.
    • While future games had multiple gameplay styles, they all, to some extent, had a heavy focus on platforming and action. This makes Big the Cat's fishing gameplay in Sonic Adventure, which is required to make it to the Final Story, far stranger and more out of place in hindsight.
    • This is the only 3D Sonic platformer to lack a ranking system or grinding on rails, which were both introduced by its sequel.
    • Sonic has to charge the Light Speed Dash (done by holding the Action Button) for several seconds to use it, while in future games, tapping the Action Button when touching a trail of rings is sufficient.
  • Earn Your Happy Ending: All six character stories, though it's rather bittersweet in Gamma's case.
  • Easter Egg:
    • Collecting rings as Sonic in Casinopolis will build up a golden statue of himself in the lobby. It takes 5,000 rings to fully complete it, even though only 400 are required to beat the level.
    • Cream the Rabbit makes a short appearance in DX when a player character exits Casinopolis. See video here.
    • This one should take a couple minutes to get to — a hidden room.
    • Each character's story provides Previously on… segments that cover the previous events in their story and indicate what they are currently doing. Some of these Previously on… segments can only be found and read under very specific circumstances that require a certain amount of Sequence Breaking. Gamma has one segment, for example, that only appears if Amy is unlocked in Gamma's story when they meet each other in the prison (which almost never happens, since Amy is more often unlocked in Sonic's story).
  • Eggshell Clothing: In DX, Chao can wear eggshells on their heads. It can only be removed if you toss the Chao at a wall. Both halves of an eggshell completely disappear in the original Dreamcast version when a Chao hatches.
  • Eldritch Abomination: Chaos, a slime creature whose innards can be seen through it. They get more mechanical as he absorbs more Emeralds, until his final form.
  • Elite Mook: The E-100 Series robots were designed by Eggman to be more more intelligent and dangerous than his normal Badniks. Gamma can challenge Sonic just on his own, and in his own story comes seconds from defeating him outright.
  • Embedded Precursor: DX includes all of the Game Gear Sonic games available to unlock, by collecting enough Emblems.
  • Eternal Engine: Final Egg. Sky Deck and Hot Shelter to a lesser extent.
  • Evil Is Not a Toy: Eggman intends to use Chaos's power to destroy Station Square and build Robotnikland on its remains, but this turns on him when it's revealed Chaos is the one using Eggman, so he can get the Chaos Emeralds and exact his revenge.
  • Exposition Fairy: Tikal is always there to guide the player.
  • Expository Pronoun: Gamma initially refers to himself with the formal neutral pronoun "watashi", but near the end of his story, he switches to the informal and masculine "boku" when he realizes that he must self-terminate in order to complete his mission, indicating his gradual humanization.
  • Expy: Twinkle Park is one for Sega's Joypolis amusement park.
  • Failed a Spot Check: While it's not acknowledged by the characters themselves, Sonic is shocked to hear from Tails that Angel Island has fallen again during the Super Sonic story, despite the fact that he is lying down in view of where it fell.
  • Fanfare: While addressing his robots, Eggman plays his own canned fanfare music. Pretty amusing.
  • Fantasy Kitchen Sink: A superpowered deity, abandoned civilizations, fantasy magic, ghosts, time travel and talking animals are all present in the game, with some science fiction elements and even a "Ghost in the Machine" story for one of the major characters sandwiched in.
  • Filler:
    • Big the Cat's plot has almost no bearing on the rest of the game's storyline. The only thing that ties him into it is that his pet frog swallowed an Emerald, and has Chaos' tail.
    • Similarly, Amy's plot is only tied in via the Emerald her Birdie is holding (which is stolen halfway in) and her being the catalyst for Gamma's Heel–Face Turn, which ironically ends his own relevance to the central story.
  • Five Rounds Rapid: The cops unloading their magazines at Chaos 0.
  • Fixed Camera: Made more adjustable in the DX version, and its later ports implemented analog camera controls.
  • Flaw Exploitation: Eggman, once again, tricks Knuckles into fighting Sonic as a way to nab two Chaos Emeralds. To a lesser degree, the first Emerald is nabbed from an opening when Sonic and Tails get cocky post-battle with Eggman's Egg Hornet.
  • Floating Continent: Angel Island before the Master Emerald was shattered, and Windy Valley. Angel Island only broke away from the mainland after Tikal used the Master Emerald to stop Chaos' rampage by sealing them both in it.
  • Foreshadowing:
    • The fact that Tikal had actually managed to send Gamma's mind to the past foreshadows him becoming sentient in his chapter.
    • At the start of Knuckles' story, when the Master Emerald is broken, you can see a Hint Ball (in other words, Tikal's spirit) fly out of it.
    • When Eggman introduces the Egg Carrier to Sonic, Tails, and Knuckles, he notes that it "pales in comparison to the power of Chaos". When he pulls out a second Egg Carrier during the Last Story, Perfect Chaos swats it out of the sky in a matter of seconds.
    • In Final Egg, Sonic & Amy will occasionally face off against a badnik known as the Egg Keeper, which can float, speed forward, and can capture the player. This otherwise one-off enemy serves as a foreshadowing for both Gamma's final boss, which utilizes the same propulsion method, as well as an enemy from a later game, Sonic Heroes, which has a similar means of halting the player's progress.
    • After Gamma first defeats Beta and earns Robotnik's permission to serve aboard the Egg Carrier, Beta silently insists on coming along with them. Annoyed, Robotnik rolls with it and allows Beta to come with them, mumbling that they could "always use a set of spare parts." Not long after, Beta is basically torn apart and rebuilt into a very different robot for his rematch with Gamma.
    • Upon biding farewell to Gamma right before the destruction of the Egg Carrier, Amy promises that they will meet again some day. Later in Super Sonic's story, we can see her accompanied by the Flicky that used to power up Gamma, indicating that they were reunited in a way.
  • Four Lines, All Waiting: Six main character storylines that both run alongside and intertwine with each other, with one overarching storyline that most of them loosely tie into (a vengeful monster has been released by the main villain, and is secretly pulling strings to eventually destroy the world).
  • Free Rotating Camera: Not universal though.
  • Friendly Playful Dolphins: Dolphins jump around you in Sonic's first stage, "Emerald Coast", if you're looking in the right place at the right time. The appearance of these dolphins and their numbers seems to be performance based, or it might be random.
  • The Friends Who Never Hang: Only Sonic and Tails interact with all five other characters in the story, with Knuckles, Amy, Big, and Gamma never really meeting one or two. They can still occasionally find them as generic NPCs to assist in unlocking them, however.
  • Frigid Water Is Harmless: Big's second stage is Icecap, which requires him to break through the ice in order to fish in its waters and catch Froggy. The fish living inside the water as well as Froggy are perfectly fine swimming inside it, and the only thing Big has to fear is drowning, especially if he didn't collect the Life Belt upgrade which allows him to swim before entering the stage. In the B and A Rank missions, Big has to swim through the secret passage under the water to get to a room where bigger fish required to complete the missions are stored.
  • Game-Breaking Bug:
    • Some of the game's glitches allow characters to access levels or parts of levels that they normally can't, and can also access stages out of order. However, doing this can cause glitches that, at best, make the level unbeatable, and at worst, make the game unbeatable. One of these is a bug that allows Knuckles to enter Casinopolis early. While you can play through the level without incident, the problem occurs when you beat it; Tikal whisks Knuckles away to the past... and he's stuck there. The game doesn't necessarily freeze, as Knuckles is still able to move around and explore, but Tikal and her father are glitched in a way that has them standing in midair. This prevents the cut-scene that ends this sequence from playing, making it literally impossible for Knuckles to ever leave the past.
    • The Crystal Ring is an optional upgrade that depletes the time it takes for Sonic's Light Speed Dash to charge. Most players grab it during their first session, but if you choose to collect it during Super Sonic's story, it will essentially ruin your save file. There is usually no auto-save point in Super Sonic's story, as it is just one long level, but acquiring the upgrade forces the game to save. That wouldn't be a problem, unless you have to switch off the console. Trying to reload the game will then lead to you seeing an otherwise-unused recap screen, before either being dumped in an inescapable Hedgehog Hammer room, a bottomless pit, or simply freezing the game altogether. Thankfully, bypassing this glitch if stumbled upon is as easy as simply beating a regular Action Stage, letting the game autosave and setup a proper load point after.
    • Windows will crash in certain times in DX, most commonly during the fight with the Egg Hornet.
    • Since none of Big's levels feature Bottomless Pits, glitching Big into falling into one (either by hacking the game to put him in such a level or glitching through the walls in the Hub World) causes the game to crash during his death scream. This is fixed in the DX version.
  • Game Mod: The 2004 PC version of the game has a dedicated modding community. Not only is there a mod loader that adds support for widescreen and custom resolutions, but mods exist that fix numerous glitches and add lost content back in (such as the DLC missions and holiday events). The Steam version can be made compatible with these mods through the BetterSADX or SADX Mod Installer tools.
    • The Dreamcast Conversion Mod faithfully restores nearly all of the textures, special effects, sounds, and level geometry of the Dreamcast version that were lost when the game was ported to other systems. The Lantern Engine mod also restores the Dreamcast's more atmospheric lighting, and yet another mod reverts the character models to their lower poly Dreamcast versions. There are also mods available that improve on changes in the DX version without replacing them with their Dreamcast counterparts.
    • A gameplay overhaul mod-hack making waves completely revamps aspects of the game by adding Shadow the Hedgehog, a better Metal Sonic, as well as an in-game Super Sonic and even Hyper Sonic. Sonic himself also gets a boost (a la Sonic Unleashed onwards), a bounce attack, instant light-speed dash, and more. And that's just Sonic. It has to be seen to be believed.
    • The SADX Heroes mod is notable for bringing stages from Sonic Heroes into Sonic Adventure DX. These aren't truncated or redesigned stages either, but direct 1-to-1 lifts from Heroes into the Adventure engine with its gameplay and enemies (thus lacking the team gameplay mechanic). Interestingly, every stage can be completed despite lacking the team-based mechanics of Sonic Heroes.
  • Gameplay Roulette:
    • The gameplay style changes very frequently in Sonic's story. Outside of the series-standard platforming, there are a couple of pinball minigames in Casinopolis, snowboarding in Icecap, racing in Twinkle Park, and two different Rail Shooter segments.
    • The non-Sonic stories mix up the gameplay styles. Tails's levels have him race against Sonic (and, later, Eggman) to get to the goal first, Knuckles has to search segments of each level to find Master Emerald pieces, Amy runs from the robot ZERO with some stealth mechanics, Gamma does timed run-and-gun sequences, and Big the Cat's story forgoes platforming almost entirely for a fishing simulator. For the most part, this is due to Sonic Adventure doubling as a sort of tech demo of what the Dreamcast was capable of doing.
  • Gameplay and Story Integration:
    • There are some really neat examples where the intertwining storylines of each character affect the game itself. For instance, the reason Sonic's Sky Deck stage tilts all over the place in its third act? That's because Knuckles is required to switch the gravity around in his segment.
    • Chao who are properly cared for are granted Born-Again Immortality and come back to life as babies at the end of their life cycle, out of sheer love for their owner. This crops up in the game itself when we see that Chaos' Chao friends have been successfully resurrecting through the years since Chaos was sealed — and when Sonic returns him to his normal form, they finally get to play with their favorite caretaker again.
    • Tails' stages have him race against other characters. When against Sonic, it's a friendly race, so if Tails falls too far behind, Sonic will stop and wait for his friend to catch up. However, when racing against Eggman, the good doctor has no such qualms about leaving Tails in the dust.
  • Gameplay and Story Segregation: In Gamma's Emerald Coast stage, he is inexplicably required to destroy Robotnik's badniks to complete the level, even though the level is set before his Heel–Face Turn.
  • Gimmick Level: Sonic's version of Casinopolis has a Chaos Emerald inside a large vault, on a platform that's too high for Sonic to jump onto. To reach the Emerald, you need to fill up the vault with 400 rings so the floor is high enough to jump off of, and to get the rings you need to play pinball (with Sonic as the ball) instead of platforming. Skilled players will know to intentionally lose a pinball game with under 100 rings in order to get to the sewer level, where it's much easier to rack up cash (this action is essential to complete the A-Rank mission, where Sonic has to destroy the capsule in under five minutes).
  • Going Through the Motions: Not a major example, but quite noticeable in Amy's ending when she performs her boss victory animation and then abruptly snaps back to her standing animation.
  • Go Through Me:
    • In the Backstory, Tikal tries to defend the Chao and the Chaos Emeralds from her dad and his soldiers. Said soldiers brusquely push her aside and proceed to incur Chaos' wrath.
    • In the aftermath of Sonic's (or Tails') fight with Gamma, regardless of who wins, Amy intervenes to convince the victor to let the other live.
  • Grand Finale: The final story opens up after finishing the other ones, revealing the truth behind Chaos and wrapping up other loose ends.
  • Gratuitous English:
    • Sonic in Japanese sometimes speaks English with a thick accent, such as when he tells players to "Serect yo kaakta!" This became a defining trait of his character in later games.
    • Level names, location names, and upgrade names are in English in both versions.
  • Gravity Screw: Most notably in Lost World, where panels on the wall glow when orientated correctly by hitting a switch, allowing Sonic and Knuckles to simply walk up the wall. The last part of Sky Deck changes orientation as well, and Knuckles can actually control this.
  • Growing with the Audience: Prior to this game, the Sonic series was a fairly standard children's video game series in terms of setting and plot. With many of the original Sonic fans grown-up, this game decided to appeal to both older and newer fans with the new direction of the game. The art style took a more realistic bent, and the story dealt with more mature themes such as the genocide of an ancient race, the growing sentience of an otherwise robotic minion, and learning to stand up for yourself, with Character Development for nearly everyone involved.
  • Guide Dang It!:
    • The game has a few Adventure Field emblems that can be tricky to find. One of them in the Mystic Ruins requires flying over a large, seemingly empty space as Knuckles — and the emblem itself won't show up because of the draw distance until you're actually close to it, so you wouldn't even think about jumping and gliding across that super large bottomless pit unless you somehow knew the emblem was there. Another one in the Egg Carrier requires you to fly on top of the giant spinning contraption at the back end of the ship's outside area as Tails, however the emblem is only collectible when the ship is in wings out mode that separates the front and back ends of the ship and allows you to enter the Sky Deck stage. You change the ship around by pressing a big red switch on the ground located in the control room near the giant spinning thing. Every time you come to the Egg Carrier after it's landed in the sea the ship is always set to wings in mode by default. It's so obscure to that even if you went up there the first time with the ship in wings in mode and found no emblem up there then you'd think that particular emblem was located somewhere else leaving you stumped until you finally looked up and found you have to transform the ship to make the emblem appear.
    • Most of the secret optional power ups/upgrades for all the characters, despite not being explained or shown in the manual, are not that difficult to find if you take time to explore the Adventure Fields (except for one upgrade for Big that is actually found in a secret area of Icecap). However, Amy's Long Hammer upgrade just takes the cake for this trope. In order to obtain it, you have to play the Hedgehog Hammer mini-game again after getting the Warrior Feather in the Adventure field (doing it from Trial mode in the game's menu will not work) and get a certain high number of points. On top of that, you have to play the mini-game after the Egg Carrier has landed in the ocean, so either go back there after killing Zero, or go back immediately after Tails drops you off in Station Square by taking the boat by the sea, and not immediately after getting the Warrior Feather. Nothing in the game ever hints at giving the Hedgehog Hammer another go after the Egg Carrier crashes, so many would have seen no point in playing the game again other than to get the emblem for it in Trial mode.
    • Amy's got another example that's more of a case of Figure It Out Yourself. She's pigeon-toed with an overlapping gait and runs a lot slower than she would otherwise, so the way to get her grade A emblems is by getting her to take the biggest leaps possible as you move through her stages.
    • Chao raising in the original Dreamcast version is poorly explained. You can only see a Chao's stats, give them a name, and have access to all the different types of fruits if you transferred them into your VMU via the machine located in every garden. However, this is not explained by the game, nor its manual. The first game has a monitor in the Station Square garden hinting that different fruits have different effects on the Chao, but doesn't explain how to obtain them. There is also a Tikal hint orb which tells the player that animals can change the Chao's appearance, but omits the fact that it also affects the Chao's stats.
  • Gusty Glade: Windy Valley, which serves as Sonic's second action stage, Tails' first, and Gamma's third. Sonic's section begins with him running through the lower parts of the valley until he reaches a tornado, which he must find his way out of, ending with him running through the upper parts of the valley to get the Purple Chaos Emerald, which forms the entirety of Tails' section. In Gamma's section, Gamma travels through the lower parts of the valley to seek out and destroy E-103 Delta. Running through the strong winds will help you get across the large gaps over them.

  • Hailfire Peaks: Played straight in Sonic's levels (and a couple of Amy's), which frequently transition from one level type to another halfway through, often with some kind of setpiece to join them together. Mostly averted with the other characters, who stick to only one section of that level.
  • Hall of Mirrors: A segment exclusive to Amy's version of Twinkle Park.
  • Heroic Sacrifice: Before the events of the game, in order to save the world from his destruction, Chaos was sealed in the Master Emerald alongside Tikal.
  • Hero vs. Villain Duet: The game's Theme Tune, "Open Your Heart," zigzags between the dark, monotone lyrics representing Chaos' perspective and the uplifting, determined lyrics representing Sonic's. In particular, the recurring instruction, "open your heart," is Sonic talking directly to Chaos.
  • Hijacked by Ganon: Inverted by Chaos taking over the role of central villain from Eggman in the final story.
  • Hints Are for Losers: Touching one Hint Orb in Knuckles' B Rank missions disqualifies you from getting the Emblem.
  • Hobbling the Giant: Tails' storyline ends with a battle against the Egg Walker. To defeat it, Tails has to get underneath it to trick it into trying to stomp him. During this time, Tails has to attack its feet, causing it to lose its balance and giving Tails the opportunity to attack Dr. Eggman, who will then be low enough for him to attack.
  • Hong Kong Dub: The lip-syncing is just plain bizarre and off a lot of the time. The Mouth Flaps are mostly just looping animations without any consideration to the dialogue, so they don't even really match the Japanese track.
  • Hope Spot: Zig-zagged at the end of Amy's story. Birdie is reunited with his family, and everything seems okay... then suddenly ZERO shows up and swats Birdie out of the sky. After ZERO's defeat, Birdie wakes up and is seemingly okay, but as he flies off, he suddenly rapidly drops from sight... only to soar triumphantly back into view and fly off with his family in tow.
  • Hostile Animatronics: Downplayed. Casinopolis features some model ships crawling with animatronic pirates; while they can damage you like any other enemy, they never actively pursue you.
  • Hub Level: The game has three interconnected ones: Station Square, Mystic Ruins, and the Egg Carrier.
  • 100% Completion:
    • Getting all 130 emblems is the goal for fully clearing the game. Emblems are rewarded for beating each story, winning the minigames and the Chao races, finding them hidden in the Adventure fields, and clearing missions in each character's Action Stages. There are three missions for each stage, with the first being simply to finish it. The other two missions for each character are:
      • Sonic: Collect 50 rings and clear the stage; clear it within an allotted timeframe.
      • Tails: Collect 50 rings and beat Sonic/Eggman; beat Sonic/Eggman again (they're faster).
      • Knuckles: Collect the emerald shards without any hints; collect them within an allotted timeframe.
      • Amy: Same as Sonic's.
      • Gamma: Collect 50 rings and destroy the target; destroy the target with a certain amount of time remaining.
      • Big: Catch a 1000g fish and Froggy; catch a 2000g fish and Froggy.
    • There is no reward for collecting all the emblems in the original Sonic Adventure other than bragging rights, but in DX, doing so will unlock Metal Sonic as a playable character in Trial mode. He's essentially just a reskin of Sonic.
  • I Die Free: Gamma's story rather morbidly invokes this when Gamma decides to rescue his E-100 series siblings by destroying them.
  • "I Want" Song: Tails's and Amy's themes: Believe in Myself and My Sweet Passion.
  • I Cannot Self-Terminate: Played with during Gamma's story. Gamma is perfectly capable of self-terminating, it's just that up until the penultimate boss Gamma doesn't realize that his self-given mission technically requires him to kill himself. The moment of contemplation concerning his mortality that he has when he realizes this is almost heart-breaking despite almost no dialogue or music being present in the scene. He ends up averting this trope and allows himself to die from his injuries so that the Flicky inside of him can be freed.
  • I Can't Believe I'm Saying This: Knuckles says this, agreeing with Tails that Sonic is the only one who can harness the true power of the Chaos Emeralds after Perfect Chaos absorbed their negative energy.
  • I Owe You My Life: Not directly stated, but Gamma's resolve to rescue the animals trapped inside the E-Series robots was partly due to Amy saving its life. Said act by Amy was also provoked by Gamma freeing her and Birdie from Eggman's cell inside the Egg Carrier (which would later crash land into the ocean) making it both issued and returned at the same time.
  • ISO-Standard Urban Groceries: The brown paper bag Amy carries in the introductory cutscene to her story.
  • Idiot Ball:
    • All three incidents when Sonic and Tails lose Chaos Emeralds to Eggman. The third time this occurs, when two Chaos Emeralds are knocked out of Sonic/Tails's Hammerspace (depending on what character you're being) by a sharp impact. He then proceeds to sit there while Eggman lazily floats over and beams them up. Eggman lampshades this in the Tails vs. Knuckles storyline, where he calls them "bumbling idiots".
    • Knuckles, who has extrasensory perception of the Master Emerald shards, chases Eggman into a private room at the Station Square hotel because he immediately presumes the shiny object Eggman is holding must be one of the shards, without noticing that he hasn't sensed it like the others.
  • Ignorant of the Call: Tikal's attempts to guide the heroes by giving them flashbacks of the past and teleporting them from place to place are fruitless — most characters who encounter her have no idea what's going on, and immediately return to their own business once the vision ends. Near the end of his story, Sonic fails to get the message that he should go after Chaos instead of Eggman. This is likely because the flashbacks are more for the player's benefit than the characters.
  • Implausible Deniability: After Eggman seizes the two Chaos Emeralds dropped during Knuckles's fight with Sonic, Sonic demands to know if Knuckles was tricked by Eggman. In Knuckles's story, he blatantly dodges blame:
    "Like, you weren't?"
  • In Case of Boss Fight, Break Glass: The Egg Viper, but it gets harder as you go on.
  • Incoming Ham: Eggman, Eggman, Eggman.
  • Indy Escape: At various points in Sonic's storyline, he has to evade the jaws of an angered orca, an avalanche and an Indiana Jones-esque flaming boulder.
  • Insecure Protagonist, Arrogant Antagonist: Tails' story in the "Rashomon"-Style plot explores his insecurities. While Tails is usually seen as a happy-go-lucky child, this game reveals that he feels guilty because he thinks he can't accomplish anything without Sonic doing it for him, and he wants more than anything to be cool and self-confident like Sonic. He is contrasted by the Big Bad, Dr. Eggman, an Insufferable Genius Mad Scientist who wants to control all of Station Square, the city where the game takes place. In the end, Tails saves the city by himself and drives Dr. Eggman to a Villainous Breakdown.
  • Insult Backfire: Sonic greets his arch-nemesis as "Eggman", who protests that his name is Dr. Robotnik. Later on, the doctor makes "EGGMAN" the password to the Chao Garden on the Egg Carrier. Averted in the Japanese version, where Eggman has always been the doctor's name, so this just doesn't happen — instead, Sonic makes a simple remark that it's been a while since they've seen each other.
  • Insurmountable Waist-High Fence: Right towards the end of Twinkle Park for Sonic, there's an iron gate blocking you from getting to a spring if you end up on the right side of it. You can barely jump higher than it by yourself and you can definitely jump higher than it if you get up some speed with a Spin Dash. However, the game won't let you pass it from that side, you have to circumnavigate the entire circular roof to approach the spring from the other side.note 
  • It Can Think: Chaos spends most of the game as Eggman's personal minion, giving the appearance of a mindless monster... but in Super Sonic's story, Chaos throws Eggman under the bus after suffering too many losses against Sonic and company. He discreetly takes all of the Chaos Emeralds for himself, allowing him to transform into Perfect Chaos and wreak havoc upon Station Square.
  • Kaizo Trap: Egg Viper. The camera angle isn't great either, so even if you know his suicide attack is coming, you won't be able to tell where he's gonna hit so you may still die anyway. And beware of losing too many platforms, because the Viper will take you down if it's the last platform remaining. Cue rage.
  • Karma Houdini: The True Final Boss, who, while defeated and rendered docile in the end, still destroyed Station Square and by rights should have killed thousands of people. He gets an utterly unironic Happy Ending.
  • Karmic Death: Implied. In the past, Chaos absorbed the Emeralds to transform into Perfect Chaos, wiping out Pachacamac and the echidnas for all of their careless warmongering.
  • Kick the Dog:
    • Eggman does it a lot in this game. He's portrayed as a lot more evil here than in most portrayals.
    • In the flashback of the final story, Pachacamac ordered the echidna warriors to charge to the Emerald shrine, trampling Tikal and injuring the Chao, just so they can seize the Chaos Emeralds. Chaos didn't take kindly to this.
  • Knight of Cerebus: Chaos. He is the first major threat Sonic and co. face that has no humorous quirks or traits whatsoever in persona and design; while his threat is genuine, he isn't seen as much more than a Dragon to Eggman until the climax and finale, when things truly take a turn for the worse when he finally turns on Eggman and gets all of the Emeralds.
  • Last Breath Bullet: The defeated E-101 mk.II gets in one last shot at Gamma before exploding; the shot fatally wounds Gamma and he too is destroyed shortly after.
  • Last Note Nightmare: "Fakery Way" for Amy's section in Twinkle Park starts out in a quiet, cute tone, but slowly becomes much more creepy and menacing.
  • Last of His Kind: Knuckles is the only echidna alive. Though Tikal's spirit lingers around after being released from inside the Master Emerald.
  • Leitmotif: Every character is accompanied by their theme tune when they appear.
  • Lens Flare: Present in some of the cutscenes, as well as Emerald Coast and Sky Chase Act I.
  • Lethal Lava Land: Red Mountain, combined with some Death Mountain. This stage serves as Sonic's seventh action stage, Knuckles' third, and Gamma's fourth. Knuckles' section has him search for the pieces of the Master Emerald around the outside of a massive volcano, while Gamma's section has him go inside the volcano to seek out and destroy E-104 Epsilon. Sonic's section consists of elements from both Knuckles and Gamma's sections, as he is first outside the volcano and must find a way inside, then must find a way out of the volcano so he can meet up with Tails.
  • Let's You and Him Fight: Eggman tricks Knuckles into fighting Sonic for the second time (or Tails if you play as him).
  • Levels Take Flight: Sky Chase reappears with two acts, and allows Tails to actually fire upon incoming enemies with his Tornado's machine guns and missiles.
  • Little "No": Sonic shouts one of these any time he dies.
  • The Load:
    • Tails generally achieves nothing worthwhile when he tags along when you play as Sonic, and he becomes outright detrimental if you're hunting down specific animals because of his tendency to run into the path of them and pick them up. Before DX, his movements followed the player's button inputs and usually lead to him going astray very quickly, and there was no way of disabling him. He tags along with Sonic as much as he can in DX, but in both versions he struggles to attack enemies and is often caught up in and immobilised by Sonic's own attacks.
    • This extends to his storyline. When they're both separated, Tails feels inadequate because he's only ever useful with Sonic around, though he figures out he can act on his own. It culminates with him deactivating the missile threatening to blow up Station Square, then defeating Eggman's Egg Walker without Sonic helping.
  • Long Song, Short Scene:
    • A few jingles and themes were unused in gameplay or for purposes different from how they are labelled (eg. "Calm After The Storm" is labelled as the theme for the crashed Egg Carrier Adventure Field in the Sound Test, but is used only in a short cutscene in Gamma's story). Many tunes were also truncated and can only be heard in full in the games' official soundtrack.
    • Subverted with the "Leading Lights" theme for Lost World. Playing through Sonic's story, it will only play in Sonic's third "act" of the level...a single room where the level ends after literally taking just a few steps. Once you play through Knuckles' version of Lost World though, you'll hear this song again, and this time it will finally get the playtime it deserves.
    • The character battle theme "Fight For My Own Way" is only heard in fights that take less than 10 seconds to complete for most players due to the opposing characters' Artificial Stupidity. One would have to actively hold back in order to hear more than the intro. Same goes for "Heartless Colleague", which plays in the similarly brief bouts with the E-Series robots.
  • Macguffin Delivery Service: Sonic and Tails don't do that great a job of keeping the Chaos Emeralds away from Eggman and Chaos.
  • Magic is Feminine: Tikal, the princess of the Echidna tribe and the only definite female member that we see in the game, is the only one who lives in harmony with the mystical Chao. Tikal also mentions that her grandmother was the one who taught her about the Chao. The other tribe members, who seem to be all male, try to destroy the Chao and their shrine, only to accidentally anger and summon Chaos, the mythical protector of the Chao, who destroys them all.
  • Malevolent Architecture: Speed Highway, a highway that uses loop-de-loops, corkscrews and has gaps missing, all while being high in the air.
  • Malicious Misnaming: Sonic addresses Knuckles as "Knucklehead" for the first time.
  • Mama Bear: Amy to Birdie. In one instance, she adamantly refuses to give Birdie to Gamma, which then led to his change of heart. In the other instance, which stands out more, Amy was enraged when ZERO knocked Birdie out cold and was very keen on bashing him with her hammer.
  • Mêlée à Trois: By the end of the game, Chaos no longer abides by Eggman's repeated failures to feed it Chaos Emeralds and lashes out, trashing Station Square and absorbs all the Emeralds power on its own. Eggman knows he screwed up so he attempts to stop Chaos himself but only sees his latest Egg Carrier destroyed. Then Sonic steps in, takes what positive energy remains in the Chaos Emeralds, turns Super, and deals with the problem.
  • Mercy Lead: A black Chao named Chacron will sometimes appear in Chao Races. Unlike the other racers, it will idly lounge at the starting line once the race starts. You will soon find out that this is a mercy lead, as once one of the other Chao is halfway through the race, it will get up and take off at a ridiculously high speed, very easily overtaking the other racers unless they have high stats themselves.
  • Metropolis Level: Speed Highway is a level taking place within the bustling heart of Station Square. It starts off with loop-de-loops on highways and precise platforming across the city skyline before transitioning to the main plaza on ground level via running down a building. Hazards include cars to avoid and Eggman's Badniks mimicking the police.
  • Missing Secret: Gamma's story recap before heading to Emerald Coast says that he must equip "S-type armor" to proceed. There is no such upgrade, and it's never mentioned outside of this text.
  • My God, What Have I Done?: Gamma begins to feel remorse in his story recap after he releases Amy and Birdie and disobeys his master's orders.
  • Mythology Gag:
    • The music for Twinkle Park's hovercraft and Windy Valley's "The Air" segments are remixes of the Panic Puppet and Green Grove themes from the Genesis version of Sonic 3D: Flickies' Island. Twinkle Park's "Pleasure Castle" stage is a remix of an unused theme from said game, too, though this wasn't known until years after the fact. Also, the second part of Emerald Coast has a Musical Nod to the first boss theme from that game. Jun Senoue, the composer for both games, stated on the official soundtrack that he included these nods because the Genesis version of Sonic 3D never got released in Japan and he didn't want his work to go to waste.
    • The invincibility music quotes "You Can Do Anything" at one point.
    • In Sonic's Casinopolis stage, you can use Sonic as a pinball ball, just like Casino Night Zone, among other examples.
    • The logo sequence in the opening FMV is a reference to the logo sequence in the OVA, even using the same sound effect.
    • The Tornado launch sequence was taken from the OVA as well, along with the idea of Knuckles being a treasure hunter.
    • The depiction of Station Square as a flooded city in ruins at the end was inspired by the ancient city ruins in the OVA, even using much of the same imagery.
    • The terms "Eggmanland" and "God of Destruction" originated in said OVA.
    • "Leading Lights" sounds very similar to Mushroom Hill Zone in parts.
    • Play the Samba GP DLC as Sonic and you'll be treated to an instrumental rendition of "Super Sonic Racing" from Sonic R.
    • The Y2K Celebration DLC adds giant Rings to Station Square and Emerald Coast reading "Millennium 2000 Welcome!" Touching them changes the background music to the Japanese/PAL version of "Palmtree Panic Zone (Present)".
  • Never Say "Die": Averted; talk to NPCs during Tails' story after Eggman sets off his missile, and they'll all be panicking over how they're about to die.
  • Nice Job Breaking It, Hero: Knuckles being tricked into fighting Sonic led the two colliding with each other. As a result, Sonic fumbles the two remaining Chaos Emeralds (one of them being green which Knuckles thought was a piece of the Master Emerald), only for Eggman to steal them and power up Chaos into his fourth form. As Sonic best puts it:
    Sonic: Smooth move, knucklehead!
  • Nice Job Fixing It, Villain:
    • Sonic does not have a way to defeat Chaos 6, but luckily Eggman keeps dropping ice-spewing egg robots onto the battlefield that Sonic can use to freeze Chaos and hit him.
    • E-101 Mark II fires one last shot at Gamma before exploding, killing them both and releasing their Flickies.
    • Eggman's mistreatment of the E-Series and Amy played part in Gamma's Heel–Face Turn. In Gamma's own story at least, had this not occurred, he would have destroyed Sonic for him.
  • No Endor Holocaust: Downplayed. The True Final Boss's big entrance into the city completely razes Station Square, which by rights should have killed thousands of people or more. The cast universally chooses to not talk about the body-count while standing amidst the wreckage. Tails even puts in a cheerful, "All's well that ends well," afterwards. The Sonic X adaptation addresses this by depicting the evacuation and subsequent clean-up.
  • No OSHA Compliance:
    • Station Square is a death trap, boasting a highway with loops and a pleasure park containing floating platforms and a hall of mirrors where the flooring tends to give way beneath you.
    • Eggman would be in trouble if a safety inspector took a good look at the Egg Carrier's Sky Deck.
  • Nobody Poops: Surprisingly averted. One Action Stage (Hot Shelter) contains men's and women's restrooms, both of which can be entered, though not used. Which is odd, since it's inhabited solely by Eggman and his army of robots.
  • Non-Indicative Name: Some of the levels as other characters, who only play in certain parts of them:
    • Casinopolis as Tails takes place entirely in the sewers.
    • Speed Highway as Knuckles features essentially none of the highways and much less speed, due to being an emerald hunting stage in the lower streets of the city.
    • Gamma's Final Egg is his first level.
    • The Western releases of Sonic Adventure DX has the added subtitle of "Director's Cut", which doesn't make sense as Takashi Iizuka, who directed the original version of the game, is not the director of DX version of the game; instead, it was directed by Kenjiro Morimoto.
  • Non-Lethal K.O.:
    • Big the Cat loses a life if he breaks the line on his Fishing Rod.
    • Gamma loses a life if the time runs out, implying that he's running on battery power.
    • Tails loses a life if he loses a race to his opponent. This makes some sense in his final Action Stage, where he races against Eggman in order to disarm a giant missile, but in all his other Stages, he's in a friendly race against Sonic to obtain a Chaos Emerald. Plot-wise, since both Sonic and Tails are collecting the Emeralds simply to keep them from Eggman, it shouldn't matter who touches them first.
  • Obvious Beta: The game was rushed for its original Japanese release after development for it was halted in order for it to be made for the Dreamcast instead, and was loaded with glitches, forcing Sonic Team to delay the U.S. release by a year to patch it up. Even then, the game still has loads of glitches, so it's very easy to break wide open, most notably in the DX port, which adds even more glitches than the original Dreamcast game. This page gives many examples of them.
  • Offscreen Moment of Awesome: Somehow, Big managed to fly Tails' highly advanced Tornado plane back to his home with zero experience. Sadly we only see a brief clip of him taking off from the Egg Carrier in it. No Sky Chase minigame for you, Big.
  • Offscreen Teleportation: ZERO in Amy's levels.
  • Offscreen Villain Dark Matter: Eggman was somehow able to build a second, fully functional Egg Carrier right alongside the original, just in time before the final battle.
  • Oh, No... Not Again!:
    • Knuckles says this when he is sent in a flashback in the past for the third time. Also, Sonic says this in his story after encountering Chaos, who has transformed into his 6th form.
    • If you fail at Sky Chase Act II, the Tornado will spiral downward in the same way it did after completing Act I. Tails even screams "Not again!"
  • One-Winged Angel: Chaos becomes his final form, Perfect Chaos, after he drains the negative energy out of all seven Chaos Emeralds.
  • Outside-Genre Foe: In almost all of the previous Sonic games, the threat always came from Eggman and his machines, and he simply intended to use the Chaos Emeralds as a means to an end. Chaos is the first major villain in the series to rely entirely on mystical powers instead of the threat of science and machinery to achieve his goals note  and unlike the black-and-white morals of Eggman, Chaos is driven by a vengeful rage to use his power to destroy the entire planet. Even Eggman is left at his mercy when he reaches his full power. He is also the first character in the series to have explicitly killed another character—specifically, he drove the entire Echidna race to near extinction.
  • Palmtree Panic: Emerald Coast. Bonus points as the 2000 Millennium DLC changes the music of this stage to the Trope Namer. This stage serves as Sonic's first action stage, Gamma's second, and Big's third. In Sonic's section, Sonic searches the beach for Tails after he crash-lands, in Gamma's, he seeks out Froggy in the first part of Sonic's section, and in Big's, he fishes for Froggy near the lighthouse that leads to the second part of Sonic's section.
  • Pals with Jesus: Tikal is friends with Chaos, God of Destruction.
  • Papa Wolf: Chaos to Tikal and the Chao, as the echidnas learned the hard way when they attacked the Chao living at the Master Emerald shrine.
  • Path of Greatest Resistance: Ever since Sonic Adventure introduced the Homing Attack, nearly all Sonic games since then have had paths identifiable (and accessible) only by finding a trail of stationary midair enemies. This is most commonly used to begin an expert path or for a shortcut; very rarely is it actually required.
  • Pattern-Coded Eggs: The Chao are virtual creatures that can be raised in Chao Gardens and used to compete in races to win emblems. While the standard Chao eggs are white with light blue spots (as the standard Chao is light blue), other Chao eggs are the same color as the Chao inside them. Such examples include the Gold, Silver, and Black eggs that can be found hidden in the adventure fields, and the rare eggs that can be bought on the black market in the DX remake of the game and the Battle remake of Sonic Adventure 2.
  • Pensieve Flashback: Tikal's M.O. for giving the playable characters Exposition on the backstory of Chaos and the ancient Echidna civilization.
  • Pinball Zone: Sonic's version of Casinopolis features Sonic and NiGHTS-themed pinball tables. Naturally, Sonic is the pinball.
  • Playable Epilogue:
    • You can still play each character's story mode (except the final story) after you've finished it, and the NPC dialogue will reflect this. Besides NPCs gaining new dialogue, you can find a card key to unlock Twinkle Circuit for characters who didn't visit Twinkle Park in their story. Mission Mode in DX also seems to take place after the main story.
    • This creates some minor continuity errors for Amy, who still has Birdie with her, and Gamma, who should be dead by the end of his story. It's likely that their "epilogues" instead take place shortly before their final bosses; unlike the other characters, Gamma's epilogue takes place at night in the Dreamcast version.
  • Plot Coupon: The Chaos Emeralds and finding them is the main focus of the story for both the heroes and the villain.
  • Police Are Useless: Station Square's police force tries to shoot Chaos 0, but being a water monster, all their bullets go right through him. Upon discovering this, they immediately retreat. This would be justified... except that Chaos has a blatantly obvious weak point in the form of its brain. You'd think they'd at least try shooting there.
  • Pooled Funds: Averted; Sonic builds a pile of 400 rings in Casinopolis so he can walk on it to get the Emerald.
  • Poor Communication Kills: Rather than talk to Sonic about why he's after the Master Emerald shards, Knuckles instead immediately starts a fight with Sonic and Tails without reasonably asking the two directly about it, which could have prevented the whole fight in the first place.
  • The Power of Friendship: The bond of Sonic with his True Companions allows him to unlock the full potential of Super Sonic with the Chaos Emeralds; Chaos had only absorbed the negative energy of the Emeralds, allowing Sonic to use the positive energy.
  • The Power of Love: The song playing through the above, "Open Your Heart", also suggests it works as this.
  • Pre-Rendered Graphics: The opening cutscene before the title screen, most scenes involving the Egg Carrier, and Perfect Chaos's introductory cutscene are all pre-rendered. The remaining cutscenes are done in-engine.
  • Product Placement: The competition-based DLC packs were sponsored by companies like Reebok and AT&T. The Reebok challenge even had you picking up Reebok sneakers that were strewn about Emerald Coast.

  • Racing Minigame:
    • Twinkle Circuit, a short race course included as part of the Twinkle Park experience. Sonic, Amy and Big can play it as soon as they have access to the area; everyone else has to wait until they complete their story modes. It's purely a time trial, with the objective being to complete three laps as fast as possible; each character's cart also performs differently, something the game never mentions.
    • All five of Tails' action stages have him racing against Sonic (and in the case of the last level, Eggman). The B Rank missions require him to reach the goal with at least 50 rings, and the A Rank missions require him to beat a faster Sonic (or Eggman).
    • The hotel of Station Square has a stadium within its Chao Garden, where you can enter the Chao you raised in races against other Chao. The animals and fruits you give your Chao will increase its stats.
  • Raising Sim: The Chao Garden, which can still be done even when the main story is completed.
  • Random Events Plot: Big's story has nothing meaningful to do with any of the other protagonists' stories. He has zero interest in the conflict over the Chaos Emeralds (he doesn't even know what they are, thinking the one in his possession is just a simple gem that he considers a lucky charm) or the threat Chaos poses. He only intersects with the other protagonists completely by chance during his quest to rescue Froggy, who himself only gets entangled in the mess thanks to consuming a Chaos Emerald and acquiring Chaos' tail and thus drawing the attention of Dr. Eggman. No one even learns Big's name at any point.
  • "Rashomon"-Style:
    • Who won in the character vs. character fights? It depends who you ask. Most of the dialogue was re-recorded for each story even when it doesn't need to be.
    • In Sonic and Tails's stories, the character played as is the one who fights most of the bosses and puts the keys in the Mystic Ruins. Chaos 4 is also apparently fought simultaneously by Sonic, Tails, and Knuckles, with the actual combatant being the one you're currently controlling. Chaos 6 is fought by Sonic and Big simultaneously but then Knuckles arrives after Sonic gives chase to Eggman and definitively defeats Chaos 6 in his own battle.
    • Also applies heavily to the dialogue in cutscenes that appeared in multiple characters' storylines. Though the general meaning of what's said stays the same, the exact words will often be different (though this doesn't occur in the Japanese version) and sometimes, which character says what will get switched around. Most notably, it occurs in Tails' story, which has large sections that overlap with Sonic's; many of Sonic's lines from his story are given to Tails instead.
  • Recurring Boss:
    • Chaos 4 is fought by Sonic, Tails and Knuckles in each of their stories, and Chaos 6 is fought by Sonic, Knuckles and Big in their playthroughs as well (though Big's fight is completely reworked to focus on his fishing mechanics). For Knuckles and Big, Chaos 6 is also the final boss of their stories.
    • Dr. Eggman's Egg Hornet is also fought twice in the game, by Sonic and Tails very early in their stories.
    • As for E-101, he's the first and last boss fought by Gamma in his story. The first fight is after completing Gamma's intro stage, while the second and last is the last boss in the playthrough.
  • Recurring Extra: There's an old man in Station Square who only ever appears in the scenarios' non-playable intros and endings, including in plain view from behind on Amy's ending screen.
  • Ridiculously Cute Critter: This game introduced Chao to the series, which are little cartoon creatures with an antenna-like shape-shifting orb floating over their heads.
  • Robo Speak: On paper, Gamma speaks like this, using stock phrases like "Insufficient data," and "Does not compute," but his voice is more of a smooth and suave baritone than purely Machine Monotone. In the Japanese text, his dialogue is spelled mostly through katakana, as well.
  • Rod And Reel Repurposed: While Big the Cat does use his fishing rod primarily for fishing, he can also use it to attack enemies from a distance if he aims it at them. He can also use his fishing rod as a club if he is standing next to an enemy.
  • Rubber-Band A.I.: Most of Tails' levels involve racing against Sonic, who is controlled by an AI trying to complete the course via the "normal" path while Tails has access to shortcuts via flying. The AI won't go outpace you too hard if you trail behind, but will also warp across the level to catch up if you go too far ahead. Even skipping whole sections of a level won't do any good.
  • The Ruins I Caused: The team looking down upon the flooded Station Square after purifying Chaos.
  • Rule of Three: Tails' and Knuckles' stories has three bosses, the goal of Knuckles' stages is to find three Master Emerald Shards, Knuckles gets a vision of the past on three separate occasions (whereas the other five characters only get one), Amy's storyline has three levels (the fewest level count any character has in this game), and three of Gamma's levels focus on hunting down the rest of the E-100 Egg Carrier crew.
  • Sampling: "Red Hot Skull", the theme that plays in the underground section in Red Mountain, samples its drumbeat from a Hip-Hop remix of "Ghetto Red Hot" by Super Cat (the instrumental version, to be exact).
  • Scenery Porn: It may look a bit dated now, but it was considered highly impressive back then when put side-by-side with games on the PlayStation and Nintendo 64. Unfortunately, DX ruined a number of the textures and scenery and every further port decreased the quality more.
  • Sealed Evil in a Can: Chaos was originally sealed in the Master Emerald along with Tikal, but in modern times, Eggman freed him by destroying the Master Emerald. As it turns out, Tikal deliberately sealed herself with him to prevent him from doing any more damage after the Echidna Tribe attacked the Master Emerald's altar. It turns out Chaos isn't actually evil, just very angry and vengeful.
  • Sealed Good in a Can: Tikal was sealed in the Master Emerald along with Chaos.
  • Self-Deprecation: Surprisingly, Big has a subtle bit of this near the end of his game, after rescuing Froggy from the Hot Shelter:
    Big: If something happens now... There's no point to my rescuin' you. I don't know who would bother to rescue us both.
    • Naturally, though, this is just before Sonic offers him a helping hand.
  • Self-Serving Memory: While it's not mentioned in the game itself, the official strategy guide gives this as the reason for any differences between the character's stories.
  • Sequence Breaking: Sonic Adventure has plenty of glitches of its own, enough for sequence breaks to be prevalent.
    • By knowing where to continuously jump at with Tails, you can glitch behind the wall at the hotel pool. From there, you can fly over to Casinopolis and complete it. However, because the doors from Casinopolis will remain closed if you didn't unlock it, you may need to do another glitch to leave.
    • Sonic's version of Casinopolis can be beaten within 15 seconds if you jump the right way and glitch through a wall to retrieve the Chaos Emerald.
    • Final Egg with Sonic can be finished in under a minute. The first section of the game has no real glitches, however the second section can be bypassed by getting inside the rotating fan which will not deactivate the death box allowing you to finish it stupid early. The third and final section is the worst. You can spin dash through a nearby wall behind the spider elevator, sending you into complete darkness, however if you steer correctly, you'll send Sonic falling down onto the end platform and finishing the stage.
    • Red Mountain has a large portion that can be skipped by less than 30 seconds in, Sonic can Spin Dash towards a rock on what appears to be a false wall which turns out to be real, then Spin Dash around this wall after landing on said rock and you'll put yourself near the entrance of the mountain. This can be broken further by activating the event lava rise box by glitching Sonic high enough to get the lava to rise to its highest height, bypassing the entire stage.
    • If you glitch correctly in Icecap with Sonic, the first section can be finished nearly in 5 seconds, the second section can be glitched right away through the large wooden door you have to find a way to open by running around, and you can glitch through a wall near the snowboarding section, allowing Sonic to run down the mountain instead, but he'll never activate the timer again, meaning that whatever time it said at the end of the second section of this stage is the time that'll finish when you reach the end of the stage regardless of how long it took.
    • Twinkle Park can be glitched as well with Sonic to allow for heavy sequence breaking. If you maneuver Sonic right, you'll skip the roller coaster. Go a step further and you can put yourself with a good Spin Dash jump right near the end of the stage.
    • A correct Spin Dash jump on Speed Highway can skip the last 30% of the first section. Another Spin Dash jump on the final section can throw you over the buildings to the exit, meaning Sonic doesn't have to run around them and waste any time.
    • If one does a good Spin Dash jump, they can skip the majority of the tornado simply by jumping in the right direction and landing on a spring, skipping the bridge and the trampoline.
    • Another good Spin Dash jump can bypass the entire final section of Sky Deck where the ship turns sideways. The player can put themselves right at the spring. If you can hit it before the ship flips entirely, you can actually finish the stage without having to monkey-bar around, then flip the ship back to a normal gravity.
    • Lost World can also be glitched with Sonic. A correct Spin Dash jump can throw Sonic through the door at the snake pool, bypassing the switch pressing section. The player has to perform this while standing on the stone snake head outside the snake pool.
    • While the most typical way of unlocking characters is to encounter them in Sonic's story, this isn't necessary. You can unlock characters after encountering them in any other character's story, leading to unusual situations like unlocking Amy after E-102.
  • Shooting Gallery: Gamma's section of Final Egg has Gamma partake in one of these, with the goal of the level being to destroy a stuffed doll of Sonic. Destroying stuffed dolls of Tails and Knuckles adds extra time to Gamma's time limit.
  • Shout-Out:
  • Shower Scene: Possible in Casinopolis with Sonic if you have him stand under a showerhead, whereupon he'll start scrubbing himself. Knuckles can also trigger the water spray, but he has no custom animation for it.
  • Slippy-Slidey Ice World: Icecap, which serves as Sonic's fourth action stage, Tails' third, and Big's second. Sonic's section first has Sonic make his way into in an icy cave, then find his way out of it, ending with a segment where he rides a snowboard to outrun an avalanche, which forms the entirety of Tails' section. Big's section has him search for Froggy in the icy cave, breaking the thin ice by tossing boulders onto it.
  • Smoke Out: Eggman employs a variety of these tricks, including a flash grenade and sleeping gas.
  • The Smurfette Principle: Out of the six playable characters, Amy is the only girl, though Tikal makes it Two Girls to a Team.
  • Soft Reboot: The game served as a "refresh" for the Sonic series after its declining popularity during the Saturn era (in no small part due to the Saturn receiving no mainline Sonic game, only getting spin-offs and ports). All of the characters were re-designed to be taller and skinnier (and in Amy's case, older as she's aged up from eight to twelve years old) as opposed to the shorter and rounder designs of the Genesis era, the Japanese continuity was adopted worldwide, with the localization excising old western concepts such as Mobius and mainstreaming the name "Dr. Eggman" in the west, the mostly pop-based soundtrack of the Genesis games was replaced by a soundtrack that encompasses multiple genres (though future games would mostly be rock-based), and the games' storylines would become darker and more complex.
  • Space Compression: Angel Island, normally depicted as a massive, verdant Floating Island in the middle of the ocean, appears in the Mystic Ruins Adventure Field as a tiny, almost-featureless island. It appears with its usual size in the CGI cutscenes. From the perspective of the Mystic Ruins explorers, though, it's as if a whole "mountain" suddenly sprang up overnight, and two rather large Action Stages are set on it (Icecap and Red Mountain).
  • Spin Attack: Tails can swipe his tails as an attack, which is upgraded to infinite spinning with the Rhythm Badge. Amy can do the Spin Hammer Attack and swing her hammer while spinning, but she can't move while spinning.
  • Spoiler Opening: The opening cinematic contains the destruction of Station Square and Chaos's final transformation. It may have been intentional, to prevent players from putting the game down after completing Sonic's story. Or just to get some extra mileage out of the lengthy FMV sequence.
  • Standard Establishing Spaceship Shot: The Egg Carrier's various appearances often start with this.
  • Stationary Boss: In Gamma's storyline, E-105 Zeta was turned into a stationary defense unit as punishment for failing to capture Froggy. When Gamma returns to the Egg Carrier after it sinks into the ocean near the end of his storyline, he finds Zeta, who serves as the boss of Hot Shelter. Being a stationary defense unit, Zeta is unable to move from his spot, and instead fires missiles at Gamma. Gamma must destroy Zeta's turrets so that Zeta will malfunction and explode, releasing the peacock trapped inside him.
  • Stock Video Game Puzzle: Quite a few different puzzles appear at varying points across the levels and characters, notably in Lost World.
  • Stuff Blowing Up: Sky Deck is full of cannons and explosions. Twinkle Park also features barrels that, once attacked, explode on a timer.
  • Sudden Name Change: The Floating Island suddenly changed to Angel Island as of this game; Angel Island Zone was the name of the first level of Sonic 3 & Knuckles, but it wasn't the name of the island itself.
  • Suddenly Voiced: Everyone. The early games didn't even have subtitled lines. Sonic and Eggman were voiced in old Japan-exclusive arcade games, most famously SegaSonic the Hedgehog, and the former had a few voice clips in Sonic the Hedgehog CD (usually upon getting a 1-Up), but not to the extent of this game.
  • Super Prototype: Subverted with the E-series robots. The first in the line, ZERO (aka E-100 Alpha), is quite inferior to even the 101 model, Beta (and also has a markedly different design compared to every subsequent model). Beta, meanwhile, loses out to the 102 model, Gamma, who then goes on a quest to destroy the rest of the series all the way through 105 Zeta. Beta gets upgraded into a "Mk. II" revision partway through Gamma's story but it doesn't help and it gets destroyed for good in the rematch.
  • Tactical Suicide Boss: There are lots of them in this game.
    • If Eggman never dug into the ground with the Egg Hornet, there's no way Sonic would be able to damage it.
    • Chaos 2 already has two very effective attacks: one has him bounce all over the arena as a giant ball, and the other covers the entire floor, so why does he have to try to punch Knuckles?
    • Had Chaos 4 never popped out of the water, Sonic, Tails, and Knuckles would have never defeated him.
    • Eggman manages to inflict this on Chaos during the Chaos 6 battle with Sonic or Knuckles. Chaos normally has no vulnerability in his Chaos 6 form, but Eggman insists on hurling ice robots into the arena. Sonic and Knuckles simply throw the ice robots at Chaos when its mouth is open, freezing the beast and making it vulnerable. Had Eggman never gotten involved, Chaos would have been unbeatable.
    • Eggman should know better than to stick his head out of the Egg Viper. He also should know better than to make its wheels separate from its body and move flat-side up.
  • Taking You with Me:
    • After the player delivers the final blow to the Egg Viper at the end of Sonic's story, you'll be notified that "he's up to something". Sure enough, Eggman will do a final attack by plowing through the platform Sonic is standing on to drop him. You will need to have at least two platforms left when you reach this stage to survive and win the fight.
    • At the end of Gamma's story, after defeating Beta Mk. II, Beta quickly shoots Gamma before Beta's destruction. This leads to Gamma's own destruction a minute later.
  • Team Rocket Wins: Playing Gamma's story at least, which allows you to fight and defeat Sonic in battle (though Amy stops him just short of finishing the job). So far Gamma is the only one of Eggman's robots to individually defeat Sonic in the games storywise (albeit branching storywise).
  • Tech Demo Game: Sonic Adventure was made partially to demonstrate all the graphical and hardware tricks the Sega Dreamcast was capable of. For instance, it's the entire reason why one of the game's antagonists is a being made out of water — as an excuse to show off the Dreamcast's state-of-the-art transparency and dynamic morphing effects. The extensive voice acting demonstrates how its games could store vast amounts of CD quality audio. There were multiple online features like message boards, leaderboards, and Downloadable Content to show off the system's Internet functionality, and even the VMU is given focus with "Chao Adventure".
  • Teeth-Clenched Teamwork: Knuckles' theme "Unknown from M.E." has a verse which he views teamwork, especially in regards to Sonic:
    I have no such things as weak spots
    Don't approve of him, but gotta trust him
    This alliance has a purpose
    This partnership is only temporary... Yeah
  • Temple of Doom: Lost World.
  • That's No Moon!: The excavation team at the Mystic Ruins is flummoxed by a "mountain" which suddenly appeared from nowhere. Unbeknownst to them (and the player, at first), it's actually Angel Island.
  • Theme Song Power Up:
    • Played with in the final battle against Perfect Chaos. "Open Your Heart" (the game's main theme and Super Sonic's personal theme, more or less) plays during the first half of the battle. After you hit the boss a number of times, he revives, and the second half plays out with his theme. It's subverted because Super Sonic doesn't defeat the bpss for good while his own theme is playing, inverted because the villain's own theme is what plays during the second half (after it's rejuvenated) so he's the one powering up to his own theme, and averted because it doesn't do a lick of good anyway (he's already losing by the time its music starts up; you just have to land the finishing blow.
    • Again played with during the Sonic vs. Gamma battle. Depending on who you play as, the character with the upper hand will have their theme play as they get ready to land the final blow. Amy will stop them just short of doing so however. In Sonic's case, however, it continues so as to be played straight as he heads off to defeat Eggman and Chaos 6.
  • This Looks Like a Job for Aquaman: While the other playable characters have cool powers and weapons, Big the Cat has only a fishing pole. While the other characters have exciting, action-packed levels, Big's levels all have Big's Froggy conveniently end up in some body of water, and the level is spent fishing Froggy out of it (though Big can destroy small mooks with his fishing pole.) It even works this way for Big's final (and only) boss. Chaos, the water Blob Monster, absorbs Froggy into its body. To beat the "boss," Big just has to fish Froggy out of Chaos' body. He doesn't really fight Chaos, but the game still treats this as a victory.
  • Timed Mission:
    • Tails' stages have him racing against Sonic and, in the last level, Eggman. He has a limited amount of time to get to the goal before they do.
    • All of Gamma's levels and his Final Boss have a 3 minute timer. The timer can be increased by destroying enemies, with the amount granted being larger if more enemies are destroyed at once. The A-Rank versions of his stages shorten the timer along with requiring the objective be attained with a certain amount of time remaining.
    • All of the A-Rank versions of the stages, with the exception of Big's levels, have a timer. Since Gamma's and Tails' levels are already timed in the other ranks, the time they are given is shortened.
  • Tranquil Fury: In contrast to his usual Large Ham, Eggman's encounter with Tails in the Egg Walker has him speak this way. Surprisingly, it's very unsettling.
  • True Final Boss: The final story has Perfect Chaos, who absorbed the negative energy of the Chaos Emeralds, combatted by Super Sonic.
  • Two Lines, No Waiting: The game contains six subplots (seven if you count Tikal's) which all come together in the last story.
  • Uncommon Time:
    • The boss music for Chaos 6 alternates between a 7/8 and a 4/4 time signature.
    • Fanfare 4 "Dr. EGGMAN" is in 7/4.
  • Understatement: Gamma's concise nature of speaking creates such gems as "This is the wrong room" after accidentally walking in on its older "brother" being seemingly cannibalized for parts and upgraded while still active, or "This presents a problem" after being seemingly teleported back in time.
  • Underwater Ruins: Lost World, in parts.
  • Under the Sea: There's watery segments here and there, but the only extended underwater segments are in Big's stages and are mostly optional.
  • The Unfought: Chaos 1 is never battled, despite being seen in a cutscene. Chaos 3 and 5 are skipped entirely due to it absorbing two emeralds at once. Also, Gamma's Boss Rush mode only includes two of his bosses.
  • Unintentionally Unwinnable:
    • The original release had several glitches that allowed you to get stuck. You can glitch through the roof of the train station at the beginning of Tails' story, and play through Casinopolis before the casino area was unlocked... only to find yourself unable to leave the area, thanks to the pathways to and from Casinopolis still being sealed shut, and stuck there by the game's auto-saving, permanently ruining the entire save file (which has stories for six characters). It isn't impossible to leave the area, but it requires pin-precision platforming to the point where those with less patience might not find wasting that time to be worth it.
    • You can opt to obtain Sonic's optional upgrade in Super Sonic's story and then save and quit. When you load the game, you'll get text indicating what has last happened in the game, just like in any other character's story. When you obtained the Crystal Ring determines what the text says. (For those who haven't played the game, that's not supposed to happen in Super Sonic's story.) When the "previously" text is finished scrolling, the game will freeze. Interestingly, the background art is the CG of Perfect Chaos as he looked before his final in-game design.
    • In the DX port, if you glitch your way into Twinkle Park with Knuckles and manage to get to the second part of the level, do not put Knuckles into the bowling ball launchers — it'll trap him in place and won't let you launch him, forcing you to restart or quit the level.
    • Super Sonic's story has no saves and is meant to be completed in one go. However, one of Sonic's upgrades is skippable, so if you put off collecting it until Super Sonic's story, some ports will force an autosave at that point, and attempting to load that save later will bring up an otherwise-unused recap screen that unavoidably crashes. The only way to fix this is to erase your entire save file and redo all six stories.
  • Unusually Uninteresting Sight:
    • Tikal and the other Echidna residents seem completely nonchalant about the heroes' presence, or even a friggin' robot in the flashbacks to the past. About the only reaction they will make is if the player attacks them or jumps on them. Though, it might be because Tikal isn't truly transporting the heroes back in time and rather making them have visions of the past.
    • The explorers in the Mystic Ruins are surprised by the sudden appearance of a "mountain" (actually the crashed Angel Island) within the ruins, but aren't concerned enough to actually explore it, instead focusing their efforts toward the nearby jungle that's been there for centuries.
  • Unwinnable by Design: A strange decision made in the Reebok challenge DLC. The last signplate of the Reebok challenge is found at the end of the first section of Emerald Coast and it's placed in such a way that will not let you pass by any means. The only way to play the rest of Emerald Coast is to delete the DLC file itself, which it tells you to do when you reach it.
  • Updated Re-release:
    • Japan received one in the form of Sonic Adventure: International, which as the title suggests, is a Japanese version of the North American/European release, which patches up several bugs that were present in the original Japanese release.
    • The GameCube DX version features redesigned graphics with updated models for the main characters (sans Eggman), added some new features, backported some of Sonic Adventure 2: Battle's improvements, a catalog of unlockable Game Gear games, and Metal Sonic as an unlockable character for collecting all Emblems. The GameCube port served as the basis for the PC, Xbox 360 and PlayStation 3, and Steam re-release versions and features higher resolution graphics with dual-analog controls for the camera, however, the game's DX content (Mission Mode and Metal Sonic) is sold separately as DLC on the HD console versions (it is thankfully kept in the PC releases) and it's limited to a 4:3 presentation.
  • Upgrade vs. Prototype Fight: Gamma the robot is made to fight its "brother" Beta, who is the more advanced of the two. To Eggman's surprise, Gamma wins, so it is charged with carrying out the doctor's missions. Later, Beta is rebuilt and battles Gamma again. Gamma just barely manages to win again, but unlike the previous battle, it results in its death.
  • Utopia Justifies the Means: Pachacamac's reasoning for wanting to take the Chaos Emeralds; he believes that it will result in prosperity for the Echidna Tribe. It does nothing to cover up his power-hungry nature and lack of regard for others.
  • Video Game 3D Leap: The true first one after the isometric Sonic 3D: Flickies' Island.
  • Video Game Caring Potential: Chao. If you are nice enough to a Chao, it will have a big smile on its face and clap whenever your character picks it up. Beware, however, that being too nice to a Chao might result in the little guy getting a spoiled personality, making it throw tantrums even when only a little hungry. Balance is the key, but regardless, if the Chao is happy enough, it will reincarnate into a baby at the end of its life.
  • Video Game Cruelty Potential:
    • Likewise, you can hit the Chao, throw it, put it in water and watch it flail if it doesn't know how to swim, make it starve, and all other sorts of things. Such abuse will result in the Chao crying a fountain of tears, blowing a raspberry at you, or if it's aggressive enough, it'll charge at you and futilely throw punches. If the Chao is more sad/angry than happy, it won't reincarnate at the end of its life. It was worse in the original version, where you can kill them outright, and E-102 could even shoot the Chao!
    • To a lesser extent, as you play a stage as Sonic with Tails following you, you will undoubtedly find yourself attacking Tails, either by jumping on him or spin dashing near him.
  • Villain Ball: Eggman's programming and distribution of his E-100 series is questionable to say the least:
    • E-102 Gamma's gameplay utilises a timer, with Gamma shutting down if it runs out. The only way to replenish it is to shoot enough targets. Of course Eggman has also sent out an army of badniks per area, leaving them Gamma's primary method of keeping his timer going.
    • After Gamma proves more competent than his brethren, Eggman fires the other three E-100 models off the elite squad to do other random less important duties. This leaves Gamma to fight Sonic solo shortly afterwards. Given Gamma alone is implied to be a tough opponent for Sonic (almost killing him in Gamma's own storyline), things might have gone quite different if Eggman had kept his other three E-Series.
  • Villainous Breakdown: An absolutely chilling one from Eggman at the end of Tails' story, not shown anywhere else. Due to the loss of both Chaos and the Egg Carrier, Eggman snaps and completely ditches his Large Ham and Card-Carrying Villain tendencies and goes from a cackling, somewhat intimidating Mad Scientist to an Omnicidal Maniac with a horrifyingly low growl of a voice. He then attempts to nuke Station Square with himself in it, and very nearly gets away with it if not for the missile being a dud. After Tails beats him to the missile and disarms it, Eggman snaps further, jumps in a giant spider-mech and resolves to kill everyone himself. This line absolutely seals it:
    Eggman: (in a low growl, directed at Tails) You fool. Away! Before I make mincemeat out of you.
  • The Voiceless: Chaos never says a word outside of bubbles and ripples in the altar pond during the flashbacks, and Tikal is the one who relays his feelings to others.
  • Warm-Up Boss:
    • For Sonic, Chaos 0, a brief and easy boss fight that the entire game starts off on.
    • For Gamma, he first fights E-101 Beta, a boss so incredibly easy that it can be beaten in less than five seconds by just button mashing Gamma's cannon.
  • Waterfront Boss Battle: Chaos 4 is fought in the pond near the entrance to the jungle. Sonic, Tails, and Knuckles have to stand on giant lily pads while Chaos 4 swims in the pond, and attack his head when he pokes it out of the water. Because it can sometimes take a while for him to poke his head out, he can on occasion be one of the longest boss fights in the game.
  • Welcome to Corneria: Averted. The human citizens of Station Square and the Mystic Ruins have different conversations depending on who they're talking to and storyline progress. There's even a few subplots, such as a shy girl steadily gathering the courage to ask a burger shop employee out, a disgruntled railroad employee eventually starting a labor strike (temporarily blocking access to the Mystic Ruins), and a couple breaking up over an affair.
  • Wham Episode: Besides being the series comeback into the mainstream, it shook a lot of things up in terms of content. The threat of Eggman is usurped by a monstrous, magical deity. The Chaos Emeralds are upgraded from bonus power-ups to magical, plot relevant artifacts, and their backstory is finally shown and elaborated upon. The tone is darker and the stakes are raised much higher than previous threats in the series. This was also the first game in the franchise where a character (or rather, an entire civilization) was out-and-out killed.
  • Wham Line: Spoken just before Gamma's final boss fight by Gamma himself, making it clear that his story will not have a happy ending.
    "Units remaining... Gamma... Beta..."
  • Wheel o' Feet: Sonic when running at top speed, but only in the original Japanese release of the game. The International version and all future versions removed the effect.
  • Where's the Kaboom?: Towards the end of Tails' story, Eggman, having lost Chaos and the Egg Carrier, decides to destroy Station Square by blowing it up with a missile. But to his dismay, it fails to explode. He goes to detonate the warhead, but Tails beats him and disables it.
  • Woobie, Destroyer of Worlds: Chaos. He only acts antagonistically because he has been sealed away so long without proper closure to the attack on the Chao and the emerald altar.
  • Word Salad Lyrics: Knuckles and Big's themes have their moments, but special mention goes to Amy's theme, "My Sweet Passion":
    I do understand the feelings of a Persian cat
    (But the Sphinx looked so cute I had to shave it)
    He reminds me of parsley when he's standing there all alone
    (Makes me wanna be his speciality)
  • "YEAH!" Shot: All the characters' end of act poses. Sonic and Tails' endings do one as a Call-Back to those of the classic Genesis games.
  • You Have Failed Me:
    • Eggman sorta does this to Gamma's E-Series brethren after they fail to retrieve the Chaos-enhanced Froggy, dispatching E105ζ (Zeta) for a torturous upgrade and demoting E103δ (Delta) and E104ε (Epsilon) to random areas.
    • After Sonic, Big, and Knuckles foil their Villain Team-Up one last time and Eggman leaves him for dead on the sinking Egg Carrier, Chaos attacks the doctor out of spite before going solo. An angry Eggman later attempts revenge with the Egg Carrier 2, but Chaos, now in Perfect form, quickly swats him away again.
  • Your Size May Vary: Similarly to when they are upgraded to the Super Emeralds in Sonic 3 & Knuckles, the Chaos Emeralds are shown to be much larger where they are too big to fit in your pocket in Angel Island during the past then later in the present time.
  • Zero-Effort Boss: The first fight against E-101 Beta in Gamma's story can be beaten in less than five seconds without even getting a chance to fire a shot by just button-mashing Gamma's cannon.

Can't hold on much longer...
But I will never let it go!
I know it's a one-way track...
Tell me now how long this'll last!
I'm not gonna think this way...
Nor will I count on others!
Close my eyes and feel the burn...
Now I see what I gotta do!
Open your heart, it's gonna be alriiiiiiiight! Yeah!


Video Example(s):

Alternative Title(s): Sonic Adventure DX Directors Cut



In most Sonic games, Tails can fly by twirling his tails like a helicopter.

How well does it match the trope?

5 (24 votes)

Example of:

Main / HeliCritter

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