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Yes, that's a Happy Tree Friend adventuring there. Yep, that extremely fragile Happy Tree Friend.
Happy Tree Friends Adventures is a fangame based off the Happy Tree Friends series created by a Polish Konami fan named Radel999 (or HTFMegaman) from deviantART.
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The series involves the main cast of HTF as they have to rescue Giggles (now Allay as of HTFA 2) from Bowser (the main villain of the Super Mario Bros. series), and the game is a crossover to many famous video game franchises like Super Mario (the most of it), Mega Man, etc. and the gameplay is a style of...you guessed it, Konami's NES games. The game is made in Multimedia Fusion 2/Clickteam Fusion 2.5 and the series was begun back in 2009, and plenty of sequels and spin-offs were made (in total of 10 as of 2016), many of them still being made or on hiatus. The list of the series' games are here:

  • Happy Tree Friends Adventures (2009, released)
  • Happy Tree Friends Adventures 2 (2010, released)
  • Happy Tree Friends Adventures 3 (2010, released)
  • Happy Tree Friends Adventures 4 (2010, released)
  • Happy Tree Friends Origins (2010, released): First spin-off centering around Lemy and Allay.
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  • Happy Tree Friends Adventures 5 (2011, released)
  • Happy Tree Friends Adventures 6 (2011, released)
  • Happy Tree Friends Adventures Game Boy (2012, released): Another spin-off and it's Exactly What It Says on the Tin, it's a Game Boy-styled spin-off. Unlike HTF Origins, the standard six Happy Tree Friends are playable instead of fan characters.
  • Happy Tree Friends Adventures Land (2013, released): The third spin-off. Not only you can play as one of the standard six Happy Tree Friends, but you can also play as Neena or Tacho, who are playable for the first time in this game.
  • Happy Tree Friends Adventures Maker (2016, released): Basically Happy Tree Friends meets Super Mario Maker.
  • Happy Tree Friends Adventures RPG: The Fire Point (2016, beta): The first and only RPG spinoff of HTFA. Made using RPG Maker VX Ace.
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  • Happy Tree Friends Adventures World (2016, incomplete): Development began in 2014. The sequel to the Land spin-off. It is revealed that the game will have its screen bigger than the previous one.
  • Happy Tree Friends Adventures 7: The Greatest Battle Ever (20??, incomplete): Development began in 2012. Currently in development hell.
  • Happy Tree Friends Adventures 3D (20??, tentative): First and likely the only 3D game of the series. However, it has almost no information of it, and it is likely confirmed that it is being made in Unity. Only sign of evidence so far is this deviation teasing the game.
  • Happy Tree Friends Adventures 8: The Daemon Conquest (20??, tentative): The tentative eighth main installment of the series.

The downloads for these games were firstly uploaded on MegaUpload officially from Radel999, but when it was shut down, many old HTFA games were lost in ashes, until somebody has recovered the games. Recently, the author himself has compiled all of the existing HTFA games (except for HTFA 2, which is still missing) along with his other game projects in a MediaFire folder.

Radel999 is on YouTube along with his Dunami Co. Ltd. channel (most of HTFA 6 and HTFA Legends related videos go here and it was never been re-used since now), however, he appears more often in deviantART, which he carries on a bunch of HTF fanart in decent HTF style. He even tried to make Bowser appear in HTF style...too, but judging from his journals, HTFA isn't the only series he made.

Happy Tree Friends Adventures Maker's levels can be shared in its own version of Maker bookmark, a WordPress blog titled simply Happy Tree Friends Adventures Bookmark. Keep in mind that the site isn't managed by Radel999 himself.

    Features characters from: 


This game provides examples of:

  • 1-Up: Can be gained from either picking up extra life items or obtaining 100 collectibles (the latter is limited to certain games).
  • Abnormal Ammo: Most of the HTFA series' playable characters throw balls instead of just melee attacking.
    • Some of the special powers can be this too. For example, Cuddles hurls a carrot.
  • Action Girl: Flaky, Petunia, Giggles, Neena and Allay (in HTF Origins).
  • Adaptational Badass: Bowser, and that's Radel 999's favourite character. He was notable for kidnapping Allay, allying with creepy aliens, and summoning his koopalings to try to end the heroes. He as well made a giant mecha in HTFA 6 and he was once friends with the HTF villains.
    • The Happy Tree Friends are given this treatment as well. They're usually known for being very fragile and die from even the slightest impact or the most mundane objects. Here, they can take several hits from any hazard (except for bottomless pits, poisonous bogs, and lava; they'll always die instantly from those hazards) before dying and are capable of taking down a huge army sent out by Bowser, which normally has enough power to kill them about a thousand times over or more if it's applied in the HTF universe.
  • Advancing Wall of Doom: A few levels in the series have one section or an entire level involving you being chased by something, usually in the form of Descending Ceiling.
    • On the rarer instances, it's the "burning hot" version of Rise to the Challenge instead.
    • Advancing Boss of Doom: In HTF Origins, a Godzilla-lookalike creature chases you when you first encountered him. You can't damage him at all until you're back at the pyramid's entrance, at which point he falls into a conveniently-placed lava pool.
  • Airborne Mook: There are several enemies that are classified as this.
  • The Amazon: The forest stages.
  • Ambidextrous Sprite: More noticeable on certain characters, like Nutty (his candy accessories switch places depending on where he's facing, same goes for his eyes).
    • For Nutty's case, it's averted in HTFA GB. Depending on which side he's facing, you can either see his normal eye (with black pupil) or his googly one (colored).
  • Anti-Frustration Features: Since HTFA 2, it has konami-style passwords as saves, until HTFA 6, it now provides a softer save data system.
  • Art Evolution: This picture explains it all, with the example of Cuddles. HTFA 1 to 4's sprites didn't look bad (keep in mind that those sprites (the playable ones) are taken from Blood Money (more specifically, basing the sprites off of Cuddles), a HTF mobile game), while in HTFA 5, it switched to a more retro-ish style, until HTFA 6 and its present games' sprites soon were made in Flash and resized into actual sprites.
    • The HTFA 6 to now sprites look like decently from the HTF series.
  • Ascended Extra: Giggles was a Damsel in Distress and Toothy was a minor NPC in HTFA 1. Starting from HTFA 2, both became a prominent part of the playable cast.
  • Author Tract: The reason why Bowser mostly appears in every HTFA game is because Radel's favourite character of all time was Bowser, also he made a contra fangame depicting Bowser in the place of Bill Rizer, and the name of the game is Bowser the Warrior.
  • Auto-Save: Used in HTFA Land.
  • Autoscrolling Level: Several final stages of the games tend to have these.
  • Badass Adorable: The playable HTF characters. See the Adaptational Badass section above for more explanation.
  • Big Bad: Bowser.
  • Big Boo's Haunt: The "undead"-themed levels.
  • Big Damn Heroes:
    • Toothy in HTFA 1, who has his spaceship ready to pick up the heroes and Giggles while Bowser's lair is collapsing.
    • The winged Yoshi in HTFA 3, who manages to save the heroes and Allay from falling to their doom after Bowser's ship self-destructed.
  • Big Fancy Castle: The castle levels.
  • Bland-Name Product: The company that made the series is named Dunami. The logo symbol hints it's based off Konami's old logo.
  • "Blind Idiot" Translation: Radel 999 is Polish and he hasn't a really good English, so the games serve many typos from his Engrish.
    • In the credits, we can see a noticeable typo as "Sound/Graphics/etc. Desinger" instead of "Designer".
  • Blow You Away: Brandy's Special Power, which involves him shooting mini-twisters.
  • Boss-Only Level: In HTFA 5, the final level of a kingdom only consists of a boss fight.
  • Bonus Boss: Flippy in HTFA 2, which can be only fought by accessing in a hidden level select screen.
  • Boss Room: Most boss levels (especially boss-only levels) take place in a single room.
  • Boss Rush: Most of the HTFA games have the previous bosses you fought before the final stage.
  • Bragging Rights Reward: Defeating Flippy in HTFA 2 will award you 20 extra lives.
  • Bubblegloop Swamp: Not really commonplace in this series. If there's one, it usually has pools of poisonous bog that can instantly kill you if you fall in.
  • Build Like an Egyptian: The pyramid levels.
  • Captain Ersatz: Look at those cute Rainbow Critters/Furries in HTFA Land... wait, what do you mean they're simply Squeakers with feet and different facial features?!
  • Character Portrait: Used in conversations in HTFA 5 and Origins.
  • Checkpoint:
    • In HTFA games with "long" levels (span multiple screens), checkpoints are placed after a screen change so if you die you end up continuing from the level segment you currently ended up instead of starting from the very beginning of the level.
    • "Save game"-wise, HTFA 3 and 5 have their own checkpoints in the form of Password Save being available per world/kingdom due to the levels in those worlds/kingdoms being shorter.
  • Checkpoint Starvation: The first HTFA game didn't have a password system, and it will be a pain to start over if you get a game over, same goes for HTFA GB.
    • HTFA Land might as well suffer from this, due to having an infamous Game-Breaking Bug regarding game saves.
  • Classic Cheat Code: In HTFA 2, after you beat the game, the credits gives you a ninfty cheat code to access the hidden menu, including all the levels and the secret Flippy boss fight. The shortcut is Shift+Ctrl+Spacebar.
    • Konami Code:In HTFA Land, it is even actually possible to do it so, it will give you 30 lives just like in the Contra series.
  • Classic Video Game "Screw You"s: Let's see here, Auto-Scrolling Level that is often found in any of the games, Slippy-Slidey Ice World levels (though not too terrible compared to the others in this list), the all too-common Goddamned Bats and Demonic Spiders, lack of Mercy Invincibility in the early games... the list goes on.
  • Climax Boss: Tiger General in HTFA 6, he's like Cossack from the Mega Man series and he's the final boss of his fortress, surprisingly, he has one of the mechas from the series too, ready to smash you.
  • Colour-Coded for Your Convenience: In HTFA 1 and HTFA Land, each character's HUD has its own color.
  • Continuing Is Painful: In HTFA games that feature long levels (that spans multiple "screen" changes), if you die you have to start over from a checkpoint (which is placed after a "screen" change). Not so if you get a Game Over instead, where if you choose to continue, you start the level ALL over again. Hurts more if the level is incredibly difficult and you often lost many lives there. Hurts even, EVEN more if the level ends with a difficult Boss Battle.
    • This can also apply to short levels, provided if the level is nearing Platform Hell status.
    • Even if you've taken notes on passwords for the earlier HTFA games, if you choose to use them to immediately access a later level, unless you're really skilled, you will possibly end up getting a Game Over early, as the game will always set the same initial number of lives (if you can't adjust them) every time it's booted.
    • HTFA 3 and 5 can feel like this if you have to quit before you finish your playthrough. Sure the games use Password Save, but a password is given per world/kingdom, not level. So, if you decided to take a break by quitting one of those games, you have to begin from the first level of a world/kingdom again if the password is used. It sure hurts for you to start a world/kingdom over if you were at the world's/kingdom's penultimate level or at its boss level prior to closing the game.
  • Convection Schmonvection
  • Convenient Weakness Placement: Boss battles involving Wheel Gator always have some kind of water containment that can be spilled via either a convenient flashing spot (in HTFA 2) or huge buttons on each side (in HTFA Land).
  • Critical Existence Failure: The Happy Tree Friends still look fine even after taking so much damage they're down to 1 hit point. Get hit at that critical state, then he/she will either explode into Ludicrous Gibs, end up brutally wounded, or collapse.
  • Crossover: This game mostly cross-overs with Super Mario Bros. due to Bowser being the main villain and is responsible for summoning his minions (including his Koopalings).
    • The later games also deal with Contra, Mega Man, Adventure Island, and some other franchises from the NES and from Konami.
    • Not to mention that Twinbee (as well as Winbee) also appear in this game as the heroes' spaceship/submarine.
    • From the HTF's Ka-Pow! series, Tiger General also appears in HTF Origins as one of the bosses and HTFA 6 as the final boss of Tiger General's fortress.
    • From the Digimon universe, the game also includes Izzy, who is playable in HTFA 6. For some reason, he appears in HTF form.
  • Cue the Sun: The credits roll of HTFA 2 shows the protagonists and Allay standing while the sun slowly rises.
  • Darker and Edgier: The final moments of every HTFA game, it can be either a (space) fortress full of minions ready to attack you and/or a alien lair.
  • A Day in the Limelight: In most HTFA games, Allay is often present in her princess form and end up being kidnapped by Bowser. In HTF Origins, you can finally get to play as her (if you choose to play as her anyway), albeit in her normal "yellow bear" look.
  • Death Is a Slap on the Wrist: In a few HTFA games, other than the ones that have Continuing Is Painful applied to them, getting a Game Over is more or less a minor annoyance (that is, if you're still allowed to continue... and you're not running out of continues (in certain games) as well).
  • Death Mountain: The mountain levels.
  • Death Throws: Used starting from HTFA 2. In HTFA 1, the playable characters simply explode into blood and gore upon death.
  • Defeat Means Playable: Only applied to Brandy in HTFA 6.
  • Degraded Boss: The boss from the Volcanic Jungle level in HTF Origins. Actually, it's applied to his machine. The Mook version of those machines are smaller and easier to destroy.
  • Demoted to Extra: Lemy. He only got one major role, and that's in a spinoff. After that, he ends up being an NPC that only appears in cutscenes in HTFA 5.
  • Denial of Diagonal Attack: In HTFA games with the more stable engine, the Happy Tree Friends can only fire horizontally. Averted in the first three games, only if you involve some jumping, and even then it's still difficult to actually fire diagonally (and they're mostly fired downwards).
  • The Dragon: Bowser sometimes has tamed monsters, one of them is a literal Dragon in Happy Tree Friends Origins.
  • Dramatic Thunder: HTFA 6 has one during the Castle intros.
  • Dummied Out: A HTFA 6 beta had a test level where Radel 999 tests out every playable character's Special Power. No such level with the similar design appears in the final game.
  • Early Installment Weirdness:
    • Comparing HTFA 1 with the next games can be quite jarring. In HTFA 1:
      • There are only four characters you can pick. Future games usually stick with the standard six plus a few other characters if necessary, with HTF Origins being the only exception.
      • Instead of a fan character, a canon character (Giggles) is the Damsel in Distress.
      • You start with three health points, but you can increase the amount by picking up Hearts (up to around 16), unlike the other games where you'll always start with the maximum amount of health.
      • The game mechanics and physics are the most broken out of all HTFA games. It's Radel's one of the earliest projects, and it shows.
      • The character's HUD is located on the bottom instead on the top part of the screen. (the only later HTFA title to have this is HTFA GB)
      • You cannot kill Cheep-Cheeps.
      • The cast can be considered minimalist compared to the future games. For one thing, no HTF fan characters appear. Second, bosses are mainly taken from ''Super Mario Bros. universe. Other non-SMB and non-HTF characters are considered lacking in variety.
      • It's the only HTFA game to depict Bowser's graphic death on-screen after you defeat him for the final time in said game. Other HTFA games either depict his base/lair destroyed/collapsed with him still inside or have him escape from said destruction.
      • There are no dialogues whatsoever. Characters began speaking starting from HTFA 2.
    • When it comes to spinoffs, the very first one, HTF Origins, is weird in its own way for having only two playable characters, and both are fan characters, no official HTF characters. It's also the only game so far where you get to interact with a NPC in-level (not counting the intro one, the intermission (between levels) ones and the pre-boss battle ones). As for the game's character cast, Origins has loads of characters (especially due to the fact that the kidnapped Happy Tree Friends are also shown on-screen) compared to the more "minimalist" cast in HTFA GB and HTFA Land.
  • Ear Wings: The rainbow critters have these.
  • Edible Collectible: Candies, fruits, etc.
  • Escape Sequence: There's one in HTF Origins where you have to run away from a Godzilla-lookalike after going to the deepest part of the pyramid in Desert of Koopa. The way it's implemented, however, looks more like a glorified Auto-Scrolling Level.
  • Eternal Engine: More noticable in HTFA 6, where its fortress levels are basically this, what with the machinery being almost everywhere there.
  • Every Playable Character Has A Special Move: The playable characters' Special Powers, which are featured starting from HTFA 6, except for HTFA GB.
  • Everything's Better with Rainbows: The Rainbow Critters and their kingdom in HTFA Land.
  • Excuse Plot: The main HTFA series' plots are like this, when Giggles/Allay gets kidnapped by Bowser, except in HTF Origins and HTFA Land.
  • Explosions in Space: Seeing that most final boss battles take place in a base located in the outer space, this trope tends to happen.
  • Fake Difficulty: For the earlier games, most of the difficulty is actually caused by the troublesome game mechanics and controls.
  • Fan Sequel: Somebody (or certainly the creator of this page) attempted once to make a fangame out of this series named Happy Tree Friends Adventures Reborn. It has a different storyline, other characters that didn't appear in the series, and even it was planned to have a really long game length of stages, but there was a word of god from the creator that it was cancelled due to lack of ideas and possibly moving on to other projects.
  • Fighting Your Friend: Brandy in HTFA 6 as one of the first 7 bosses, many players find it out he was brainwashed.
  • Final Boss Preview: In HTFA 2, the 6th stage's boss is Bowser along with an creepy looking alien head from Wai Wai World, which is then also fought in the final stage.
  • Flash of Pain: Depending on the game and boss.
  • Floating Platforms
  • Follow The Jewels/Gems
  • Frickin' Laser Beams: For his Special Power, Izzy carries a Ray Gun that he can use to shoot laser, probably to make up for the fact that his Digimon partner doesn't appear in the series.
  • Game-Breaking Bug
    • In most HTFA games, if your computer isn't fast enough, stage elements (particularly moving platforms and certain bosses) may behave strangely and can cause Unwinnable condition.
    • HTFA Land's notable flaw is its tendency to crash when loading a saved game. Other times, the save game can be loaded, but rendered useless after a few levels as it will end up crashing anyway.
    • In HTFA 6, a somewhat rare glitch can cause your character to get stuck in swimming sections where the passage (vertical only) is as wide as your character. "Wide", as in being as wide as the characters with large tail, which there are 5 of them (out of 8).
    • HTFA Maker has one where if you place the flag on brick tiles (and no other tiles of a different kind), the Bowser flag and your character will go down indefinitely, necessitating a fix.
  • Game Engine: The series runs on a game engine made by Radel 999 himself called "Happy Engine Friends".
  • Game-Over Man:
    • HTFA 1 has Bowser standing in the background while all four protagonists fall into spikes when you get a game over. "YOU MUST DIE"
    • In HTFA 6, the game over screen features Bowser once again, who has decapitated Cuddles and Giggles.
    • HTFA Land depicts Bowser flying in his Clown Car in the game over screen.
  • Gameplay Ally Immortality: HTFA 4's fourth level and one level in HTFA 5 have Neena carry you across the sea via water-skiing. In both cases, Neena can't be harmed and can pass through obstacles just fine (even despite the latter case having Neena semi-controllable by allowing her to jump along with the player).
  • Gangplank Galleon: The ship levels.
  • The Goomba:
    • From the first four games, the unarmed Hammer Bros take this role. They are common enemies that walk back and forth, only dealing damage via Collision Damage, and die in one hit.
    • In HTF Origins and HTFA 5-6, green Koopa Troopas are this. They're also this in HTFA GB, too, even though it marked the debut of a Goomba (albeit its subspecies, the Paragoomba), thanks to the latter being less common than the former.
    • Only starting from HTFA Land do the proper Goombas appear and take this role.
  • Goomba Stomp: In HTF Origins and HTFA Land, you can have chance to stomp several enemies.
  • Green Hill Zone: The first levels of each game tend to be this.
  • Guest Fighter: A non-Fighting Game example. Izzy appears as a playable character in HTFA 6, albeit in HTF form.
  • Happy Ending Override: The introductory cutscene in HTFA 5 shows the ending of HTFA 4 (where the heroes managed to escape Bowser's space station that was in the middle of blowing up), but later on it's revealed that Bowser somehow hitched a ride inside a meteorite(?!) which crashed not far where Allay lives. Bowser then immediately kidnapped Allay once again.
  • Hard Levels, Easy Bosses: Applied to the first HTFA. The levels tend to be hard due to the broken physics and the near-lack of Mercy Invincibility, while every boss except the last one is actually very easy to beat.
  • Head Swap: Notable examples include the majority of the Koopa Masters in HTFA 6, with half of its members being simply Robot Masters with Koopa heads and the Robo Koopa in HTFA GB, who is basically a Bionic Commando boss with a Koopa head.
    • For an enemy example, the Koopa Muscler in HTFA 6. From the name alone, Radel 999 didn't even try to hide the fact that it's Power Muscler with a Bowser-like face.
  • Healing Checkpoint: Each time you get in the next part of a level, your health seems to be recovered.
  • Hearts Are Health
  • Heavily Armored Mook: In later levels of HTFA 4, you can find gray Hammer Bros that stop you on your tracks and force you to fight against them. Unlike regular Hammer Bros and Fire Bros, they take multiple hits before losing their "armor" and reverting back to a normal Hammer Bro. Their only means of attacking is throwing hammers which burst into flame sparks when they hit the ground. You can even encounter more than one in the same fight, but the group can take similar punishment as a lone one as if they have a shared health bar.
  • Hyperspace Arsenal: One must wonder where those tree friends keep the balls/orbs/Special Power-based objects for their projectile weapon. This is the only answer, since they all have an infinite supply of balls/orbs/Special Power weapons.
  • Iconic Sequel Character: Neena and Tacho were introduced in HTFA 4. Both of them are now as iconic as the six main characters, even becoming playable in HTFA Land. Not convinced enough? Take a look at Radel's DeviantArt gallery and favorites. Especially his favorites. Whenever he's requesting for a fanart, he usually mentions the two fan characters, along with his own.
  • Immediate Sequel: See the Happy Ending Override section.
  • Improbable Weapon User: For an example, Cuddles uses carrots as weapon, which can also somehow break fragile walls.
  • In a Single Bound: Flaky's most recent Special Power invokes this.
  • Inescapable Ambush: Later levels of HTFA 4 have certain sections where you can't go back or progress further unless you defeat all (as in, remove the armor) of the armored Hammer Bros.
  • In Name Only: Starting from HTFA Maker onwards (though HTFA GB started it first), the series has become "Happy Tree Friends In Name Only" because of HTFMegaman's plan of removing all blood and gore in the later games. For those who haven't watched the HTF show, it's well-known for blood and gore applied to adorable critters as part of its Black Comedy purpose, so removing them while still keeping the canon characters in the cast (albeit changed according to HTFMegaman's liking) will result in this trope.
  • Instant 180-Degree Turn
  • Interface Spoiler: If you've watched the W.A.R. Journal short, this should hint you that the first fortress you're going to actually belongs to Tiger General, thanks to the yellow symbol on the fortress.
  • Invincibility Power-Up: Only in HTF Origins. Plays the Bomberman music when picked up.
  • Kid Hero: Despite their vague age in canon, the playable cast is this, thanks to the creator making up their ages (the six standard playable characters are 9 according to him; other playable characters tend to be older).
  • La Résistance: The heroes are a team of cute animals and there are 8 of them as of the current HTFA games.
  • Later Installment Weirdness: HTFA Maker is the first HTFA game published after Radel999's confirmation regarding the removal of blood and gore from the later entries in the series (though HTFA GB already did it first; meanwhile, the still beta HTFA RPG was actually developed prior to said announcement). Considering this is still Happy Tree Friends fanwork, the weirdness of this later title is noticeable.
    • Organic enemies now explode in a puff of smoke (in HTFA GB, they simply explode without any blood) instead of blood and gore. Even the Happy Tree Friends don't bleed anymore when they get damaged by enemies/hazards.
    • The rather-jarring voice change applied to some of the playable characters. Flaky, Petunia, Nutty and Giggles's voice actors have been changed for HTFA Maker, and when compared to previous voice actors and the original show's voices, the only conclusion that can be made is the fact that the four characters' voices end up being way too high-pitched compared to their original voices. Keep in mind that the previous voice actors actually tried to emulate their original voice, even if it's slightly off. In HTFA Maker, they end up sounding way off from how they originally sound in the show, with Flaky and Petunia suffering the worst (not only being way too high-pitched, but when speaking, they don't sound like themselves at all). Nutty's new voice actor at least tried to emulate his laughs and Giggles's new voice sounds a little bit closer to how Lori Jee would voice her in the later seasons of the HTF show (albeit, once again, being more high-pitched).
  • Lava Pit: A common hazard in the series. Often found in caves and Bowser's territory.
  • Law of 100: In certain games, collecting 100 collectibles (usually valuables like jewels and gems) will reward you with an extra life.
  • Leap of Faith: The "Game Boy"-styled spinoff is the worst offender. Due to the "zoomed-in" look, whenever you come across what seems to be a huge gap, you might be unsure whether to jump down or not, as more often than not, a bottomless pit is indeed a bottomless pit. Few of these cases are usually accompanied by an arrow pointing down, but why those arrows aren't used on other places is never known. Another way to check for safety is to see if there are visible, on-ground enemies walking by. If there are no other clues, you may as well try jumping down and hope you land on solid ground.
  • Lethal Lava Land: Many final stages have these, serving as Bowser's homes.
  • Let's Play: This game is obscure in popularity, but there are few people who played this game and atleast made playthroughs of it.
  • Level Ate: There's one level in HTFA 4 which is made up of cakes.
  • Level Editor: The whole point of HTFA Maker.
  • Level Goal: The Super Mario World gates in HTFA 1, the "GOAL" sign in HTFA 3, defeating Birdo in HTFA 5, and the Super Mario Bros.-esque flagpole in HTFA Land and Maker.
  • Levels Take Flight: In HTFA 2, there's one level where you ride either Twin Bee or Win Bee to go to the outer space.
  • Life Meter: Its appearance and amount of hit points contained depend on game. HTFA GB has the shortest Life Meter with only 5 hit points at max.
  • Lift of Doom: A few levels contain this gimmick. The reverse version, as in it moves down instead of rising up, can be found in the second level of HTFA 4.
  • Lighter and Softer: Overall, the series feels like this. You go from the earlier titles, which often involve abominations like the ones from Contra and, for the Origins spinoff, a dark plot, to the more fantasy-esque HTFA 5, then take a little dip to the Darker and Edgier HTFA 6, then come back out with the less dark HTFA GB and the more colorful and closer to Super Mario Bros. HTFA game, HTFA Land (though it has one level based on the Darker and Edgier near-endgame levels in early HTFA games). Now it's confirmed via Word of God that the fangame series will lack blood and gore (as well as horrible injuries) that the HTF show is known for, starting from HTFA Maker (though HTFA GB started it first).
  • Loads and Loads of Characters
  • Long Title: The name Happy Tree Friends Adventures is already quite long, but with the addition of title "suffixes" or subtitles, it becomes even longer. People usually refer to the series as either "HTF Adventures" or simply "HTFA".
  • Luck-Based Mission: In HTFA 4, the boss battle against Ludwig is this, as mentioned in the Nintendo Hard section. His machine fires one bullet per shot, but there's no exact pattern of where the bullet will be shot to. So, you can either avoid many of his bullets easily without losing a life, finally defeat him after losing several lives, or getting a game over often.
  • Ludicrous Gibs: Each enemy you kill explodes into a gorefest just like seen in Happy Tree Friends' episodes. Averted in HTFA GB and the later games starting from HTFA Maker, as confirmed by Word of God.
  • Making a Splash: Toothy's Special Power, which involves him shooting his own tears.
  • Meaningless Lives: In games where lives can be easily replenished by picking up enough collectibles (in addition to the usual extra life pick-ups), it's hard to run out of lives unless you do so deliberately. Especially noticeable in HTFA Land, where every time you die, the number of gems collected simply resets back to the amount when you first begin the level, thus allowing you to recover your previously-lost life easily by recollecting the gems again.
    • Up to Eleven in HTFA 2, where you can simply farm lives from the boss battle against Flippy, which will always give you 20 extra lives after defeating him. Considering that a session can be done in roughly 2 minutes, this makes the whole life-farming in this game a borderline Game-Breaker.
  • Mega Crossover: See Crossover above.
  • Musical Nod: The series' music come from many well-known NES games from popular franchises and several Konami games.
  • New Work, Recycled Graphics:
    • Three HTFA games after the first often re-use character sprites from the first. In turn, several graphical elements from HTFA 2 (like the HUD) had their graphics re-used in HTFA 3 and 4. Meanwhile, the polished Happy Tree Friends sprites are re-used in HTF Origins.
    • Enemy graphics used in HTFA 5 are then mostly re-used in HTFA 6.
  • Night of the Living Mooks: In haunted/ghostly-themed levels, you can encounter this type of Mook.
  • Nintendo Hard: Surprisingly, few bosses and levels may tend to be hard for some players.
    • For example, HTFA 4 has Ludwig von Koopa's flying machine serving as the surfing stage boss, with his bullets that are almost unavoidable and it's nearly the hardest for players.
  • Nostalgia Level: One fan managed to re-create the first level from HTFA 1 in HTFA Maker. Load up your own HTFA Maker app and load this level to check it out.
  • Not the Intended Use: The password system in the HTFA games that use them. It's intended to be a Password Save system, but due to how the password system works (and the fact that the passwords are never randomized per level/world), once a player discovers and remembers a given password, that player can simply enter said password to warp to a later level. Having trouble with a level in your current run? Skip to another, provided you know the password. You can also warp to an earlier, easier level if you want to farm extra lives. If you've discovered a password for the final level? Just warp to said level, provided you're able to handle the final boss (and Boss Rush sections if any). This can result in some HTFA games lasting only a few minutes because of this exploit. Downplayed in HTFA 3 and 5, where using a password will warp you to the first level of a given world instead of on any level. But still, nothing stops you from warping to the final world, once again provided you can handle the later levels and boss battle(s).
    • This may be the reason why HTFA 6 and the Land spin-off use the regular save system (HTFA GB lacking a save system is intentional in order to emulate the limitations of Game Boy games), though the latter game may as well lack any due to a Game-Breaking Bug.
  • Numbered Sequels
  • Obvious Beta: The earlier games. Good thing the series keeps improving.
  • Officially Shortened Title: Radel himself doesn't mind calling the series' title "HTF Adventures" or simply HTFA. The title's full name qualifies as a Long Title anyway.
  • Off-Model:
    • In the first three HTFA games, Flaky had visible ears, which coincidentally makes it an accidental Development Gag on part of the actual show (one of the early HTF concept arts depicts Flaky (at that time named Corky) with ears).
    • Giggles lacked her diamond-shaped marking on her head in those three games as well.
    • Petunia was depicted with a flat tail, also in those first three HTFA games. Unfortunately, Nutty's tail (same case as Petunia's) wasn't revised at all in HTFA 4, unlike Petunia's.
    • Related to those games, pretty much every Happy Tree Friend not named Cuddles (except for Flippy in HTFA 2 only, whose sprite was taken from Flippy Attack instead) suffer from this because of how awkward the sprite edits look (weirdly enough, neither Giggles nor Petunia use their own sprites from the same game where Cuddles's sprite originated). It was until HTFA 4 the Blood Money sprites became slightly polished, and by HTFA 5, Radel pretty much ditched those sprites.
    • Tacho the wolf has two designs, the second of which being his updated look. Despite this, Radel still prefers to use the older one.
    • The canon HTF characters' mugshots still use their pre-TV series design.
    • In HTFA 1, Giga Bowser looks more like a plain gigantic version of Bowser than the Super Smash Bros. monster he's known for.
  • One-Hit Polykill: Some Special Powers can result in this if you fire a single shot to a group of weak enemies.
  • One Steve Limit:
    • The limit is a bit broken notably in HTFA 6 where there are two instances where the name Fire Koopa is used: one for the regular enemies that spew fireballs as their attack (and they have a winged/"para" variant) and one for the early-game boss.
    • For this series in general, there's Lemy the lemur and Lemmy the Koopaling.
  • One-Winged Angel: In some HTFA games, Bowser grows up in his giant size for his 2nd form from something like a spell.
    • In HTFA 6, instead, he uses his giant mecha looking like himself in the final battle against him.
  • Palmtree Panic: The beach levels.
  • Password Save: Used in the all HTFA games prior to HTFA 6, except for the first game.
  • People Jars: One example can be found in HTFA Land. In the level "Fake Bowser Clone Laboratory", there are several jars filled with the still-developing Fake Bowsers that litter the place.
  • Plagiarism: This fan game series is notorious for re-using assets (graphics and music) from already existing games. So much that the original content is very little to none. While Radel did give credit to some of the asset creators, there are still several (mostly music and unique sound effects) that went by uncredited (so this issue still counts), and thus making the already horrible series (yet still charming in a different way) even more horrible. In fact, this is one of the main criticisms pointed at the series, along with the premise.
  • Platform Hell: Most of these games do have waves of moving platforms along with a deadly pit, be straightly careful when you get to parts like this.
  • Playing with Fire: Common attacks used by most enemies and bosses. Also, Tacho's Special Power.
  • Plot Coupon: The keys in HTF Origins. They're required to access Bowser's empire.
    • The diamonds in HTFA GB. They can only be gained from bosses (except in the last level) and function simply as a proof that you've beaten a level.
    • Plot Coupon That Does Something: The red orbs that are gained from defeating the first seven bosses in HTFA 6. They're actually required to access the first fortress, but as Izzy stated, the orbs also contain a hidden power that grants the Happy Tree Friends (and Izzy himself) a special ability each. These special abilities are part of the Special Power mechanic in-game, where a button (by default, Spacebar) can be used to utilize that power and a new type of item pretty much refills the secondary gauge underneath the character's lifebar. The Special Power mechanic even extends to the future HTFA games (except for HTFA GB).
  • Post-End Game Content: In HTFA 2 and HTFA Land, you will be hinted a cheat code in the credits, see Classic Cheat Code and Konami Code above.
  • Promoted to Playable: Brandy becomes playable when you beat him in HTFA 6, while Izzy is later unlocked after beating all the first bosses.
    • Neena and Tacho spend most of their time as NPCs. They're now playable in HTFA Land.
  • Put on a Bus: The Koopalings haven't made another appearance since HTFA 4.
  • Quicksand Sucks: The desert levels tend to have this.
  • Ratchet Scrolling: Thankfully none in most levels, but vertical levels tend to have this when it's not about Rise to the Challenge or Descending Ceiling...
  • Recycled Soundtrack: The games mostly use music from many games, see Musical Nod above.
  • Remilitarized Zone: Most notably, later levels of HTF Origins have this feel.
  • Re Traux: The games tend to be in NES style and it's based off Konami's NES games, unlike the graphics, they're not 8-bit that much.
    • HTFA GB is actually in Game Boy style.
  • Ruins for Ruins' Sake: The levels taking place in the ruins. It's never explained why those ruins are present.
  • The Ruins I Caused: Some HTFA games show a shot of Bowser's lair collapsing into debris after the final battle.
  • Save Point: HTFA 6 gives you a choice whether to save your progress or not after a level.
  • Save the Princess: The typical plot for most HTFA games.
  • Score Screen: In certain games.
  • Scrolling Text: HTFA 4 uses this in cutscenes.
  • Secondary Fire: Most special powers tend to have this trait.
  • Secret Level: There's one in HTFA 2. It merely consists of a boss fight against Flippy, where beating him gives you 20 extra lives to start your adventure with.
  • Self-Imposed Challenge: Despite no one attempting this kind of challenge (as of this writing), due to how the game is set up, you can either try:
    • 100% Completion: This means that you have to collect all pickups (gems/fruits, power-ups, etc.) and defeat all enemies (that aren't invulnerable, obviously). The series never keeps track of %-completion, so this can fit in such challenge. It's harder than it sounds. For a better challenge, either play HTFA 1 or GB with this exact restriction or play the other HTFA games with this restriction but you're not allowed to reset (either using passwords or loading saves). HTFA Land might unintentionally reinforce the latter due to a Game-Breaking Bug regarding game saves.
    • Minimalist Run: Collect as few pickups as possible (if possible, never picking up items at all). The latter tends to be outright impossible in some games due to certain item placements outright blocking the only path to move forward.
    • No-Damage Run: Never take any damage.
    • Solo-Character Run: As each character tends to have their own distinct trait that distinguishes them from each other, challenges like Flaky-only run (her high jump can be useful for Speedruns), Petunia-/Giggles-only run (same reason as Flaky, but more emphasis on speed than taking tricky shortcuts), etc. are possible. Some character-only runs tend to be rather dull due to traits that don't make much difference in gameplay (Nutty, Lemy, Allay, Tacho) and certain characters aren't possible to be used in a pure Solo-Character Run due to being need to be unlocked (Brandy, Izzy).
    • Obviously, there's the usual Speedrun challenge. As mentioned above, Petunia and Giggles are recommended choices for such run.
    • For HTFA 6 and later games (except for HTFA GB), the no-"Special Power" run, meaning you can only damage enemies with your regular shots and you can't take advantage of Special Powers for level navigation (Cuddles's Carrot Drill, Flaky's High Jump).
    • For Origins and Land, the "no stomping on enemies" run. For the latter game, try doing so while also restricted by the no-"Special Power" challenge mentioned above.
    • For games with adjustable number of starting lives, you can set the number to 1, which essentially makes it a No Death Run, only if you also agree to not pick up any extra lives and agree to not have 100 collectibles (only possible in certain games). Combined with "no continuing from passwords/game saves", the challenge becomes Final Death Mode.
  • Sequel Difficulty Drop: While the first three HTFA games are horribly affected by Fake Difficulty in the form of clunky physics and mechanics, the last of the three is considered much easier than the first two. Boss battles can be easily exploited, levels are made easier and there are almost no tricky enemies.
    • When it comes to the more "fixed" engine, HTFA 5 is considerably easier than HTFA 4, also for the same reason as the above sans the exploitable boss battles. Both have difficult bosses on their own, though.
  • Sequel Difficulty Spike: Try playing HTFA 6 right after HTFA 5. The legitimate difficulty added is so sudden that players can end up dying more often in the former than the latter.
  • Sequel Hook: HTFA Land has the words "To be continued..." after the credits, hinting at a possible sequel. Said sequel has been revealed as Happy Tree Friends Adventures World.
  • Sequential Boss: Some HTFA games have the final boss battles being this.
    • The final boss battle in HTFA 2 has you fight Bowser and his alien pet once again (first encountered in that game's sixth level), then you end up fighting a gigantic version of Bowser once the first round was finished.
    • In HTFA 3, you fight Shi-vai first before fighting Bowser himself. After finally defeating the latter, the battle isn't finished yet. One last battle pits you against Giga Bowser.
    • HTFA 4 has you fight Bowser twice in the same room (albeit with different boss strategies). The battle after those two has you fight the gigantic Bowser once again.
    • HTFA 6 has you fight Bowser's mech. After depleting the health of said mech, its head part flies off and reveals Bowser riding said head part like a flying vehicle, and you have to battle him in that state before the game can end properly.
    • HTF Origins has a one-on-one fight against Bowser in the end of the final level. After that, Bowser makes a comeback by riding a mech.
    • HTFA GB has you go through a Boss Rush before facing a mech shaped like Bowser's head. Defeating it allows you to have a proper battle against Bowser himself.
    • HTFA Land's final boss battle is divided into two rounds. The first is ridiculously easy, being a throwback to Super Mario Bros. boss battles. The second one, however... let's just say that if the game messes up, get ready to start over.note 
  • Shifting Sand Land: The desert levels.
  • Shockwave Stomp: Used by Spiked Pirate in HTFA GB.
  • Shout-Out:
  • Side View
  • Slippy-Slidey Ice World: The icy/snowy levels.
  • Sound of No Damage: Can be heard during battle against Wheel Gator if he's hit normally, as he is only weak against water (Toothy's Tear Pump doesn't work, for some reason).
  • Special Attack: The special powers. Limited in use and its gauge can be replenished by picking up special candies.
  • Spikes of Doom
  • Spread Shot: In HTF Origins, there's a powerup which shoots 3-way balls.
    • Brandy and Neena's Special Power is this.
  • Springs, Springs Everywhere: A few levels in HTFA Land feature many springboards for level navigation.
    • You can also induce this in HTFA Maker by creating a level with lots of springboards.
  • The Stinger:
    • After the credits roll in HTFA 2, a message is shown as a hint to access the hidden level select screen.
    • In HTFA 5, if you choose to sit through the credits, the message "Happy Tree Friends is not dead" can be seen after the credits end. This is actually a reference to the HTF show's hiatus that occurred between early 2011 (or late 2010 if one uses the "See You Later, Elevator"'s release date) to Christmas 2011, and that hiatus period is infamous for the HTF Break episodes that mostly end with the "Happy Tree Friends is dead!" message, which for the first time may alert the fans, but after several times end up irritating them. HTFA 5 itself was made during the show's hiatus.
    • HTFA 6 originally didn't have this. However, its most recent update includes this in the form of Mega Man showing up after the "Presented by Dunami" message comes up, which marks the end of the credits roll. He's shown holding up a wooden sign with a rather hilarious Engrish message: "Stop lefting HTF fandom!"
    • After HTFA Land's credits roll ends, the heroes are shown standing together on the grassy ground... while Bowser falls into the water in the distance (followed by the text "To be continued..."). The screen then turns into black and the game says "Good bye and see (you) next time in Happy Tree Friends Adventures 7!". The game also tells you in that same screen that you can get 30 extra lives by performing the Konami code.
  • Sturgeon's Law: Applied to HTFA Maker, obviously, since the levels are user-generated.
  • Sugar Bowl: Happy Tree Kingdom, the kingdom the protagonists are living in.
    • In HTFA Land, there's Rainbow World where the rainbow critters originally reside. A Sugar Apocalypse in the form of Bowser's army taking over that world is actually happening when you get there.
  • Super Not-Drowning Skills: The playable characters can swim, yes, but they're not equipped with any kind of diving gear. Normally, in HTF universe, they'd drown easily.
  • Super Title 64 Advance: Happy Tree Friends Adventures Game Boy, despite not actually being released for Game Boy. It's actually a Retraux game in Game Boy style.
  • Taken for Granite: Nutty's Special Power allows him to freeze weak enemies into a chocolate block.
  • This Is a Carrot Drill
  • Tomato Surprise: In HTFA 6, after you defeat Tiger General, Bowser zaps the dead corpse with a thunder and shows up, flying in his clown car and informing the heroes to get him on his fortress.
  • Transformation Trinket: Allay's crown, when worn, can transform her from being an ordinary yellow bear with brown hair and blue outfit to a pink princess bear in red dress (as shown in HTFA 3). Note that this isn't actually part of her character, as it's only made up by Radel himself and Allay herself isn't his fan character to begin with, which can make other people not knowing the real Allay mistake her for Radel's character (this is often shown in fanworks, where the character is often credited to Radel himself).
  • Trial-and-Error Gameplay: A certain vertical section in the second level of Bowser's fortress. Unless you know full well which directions you will take when falling through this section, get ready to die multiple times in this section, as the hazards there deal 3 points of damage each (when the player's max is 8).
  • Underground Level: The levels that take place in, well, underground.
  • Under the Sea: The completely underwater levels.
  • Unexpected Gameplay Change: In HTFA 2, the two levels where you get to ride either TwinBee or WinBee are shmup levels.
  • Unexplained Recovery: No matter how many times Bowser ended up dying after almost each game (this is more prevalent in the earlier titles), he'll always come back unharmed and ready to kidnap someone once again. HTFA 5 tried to justify his survival after his defeat in HTFA 4 by having him hitching a ride inside a meteorite, which is just as absurd as it sounds. He might be like the Happy Tree Friends, though, as they always come back from every death as well, and how they fully recovered also remains a mystery.
  • The Unfought: In HTFA 6, Pete the Koopa and the twin raccoons Lifty and Shifty.
  • Unwinnable: If a Game-Breaking Bug is in effect, most of the time. It's even worse on games that lack any save feature (HTFA 1, HTFA GB).
    • In HTFA Maker, due to the levels being entirely user-generated, this issue can happen either due to the lack of testing or use of wrong character when a player gets to play it. For example, a level that requires a high jumper to progress through the level is literally unplayable with any character but Flaky.
  • Victory Pose: Used in HTFA Land and HTFA Maker.
  • Voice Grunting: Starting from HTFA 4 onwards (except for HTFA GB), every playable character is given short voice clips whenever they jump, getting an extra life or die. Starting from HTFA 6, they also make a noise every time they shoot.
  • Waddling Head: The rainbow critters in HTFA Land.
  • Walk, Don't Swim: Applied in the games prior to HTFA 5.
  • A Winner Is You: Hilariously, some HTFA games' credits have these Engrish style sentences because of Radel 999's English grammar.
  • Your Size May Vary: One notable example: A Yoshi appears in HTFA 3, 6 and Land. In HTFA 3, he's large enough to hold seven Happy Tree Friends on his back, while in HTFA 6 he's a lot smaller and can only carry one. A somewhat bigger Yoshi (compared to the one in HTFA 6) appears in HTFA Land, and he can carry up to two Happy Tree Friends.
    • An extreme example: Bowser is about one head taller than the Happy Tree Friends in HTFA 2. Yet in the same game, Ludwig is about twice the height of Bowser! ...Must be the magic.
    • In general, due to the varying sprite sizes used in each game or every few games, a character's size in comparison to others tend to be inconsistent.
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