[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/sonic_blast.png]]
[[caption-width-right:350:Get ready to blast off!]]

''Sonic Blast'' (''G Sonic'' in Japanese) is a 1996 UsefulNotes/GameGear ''Franchise/SonicTheHedgehog'' game, and the penultimate game Creator/{{Sega}} released for that system, preceding ''VideoGame/TheLostWorldJurassicPark''. (As usual, it was also converted to the [[UsefulNotes/SegaMasterSystem Master System]] for the Brazilian market.)

The game was marketed alongside the console game ''VideoGame/Sonic3DBlast'', which launched the same year. While the game lacks similarity to ''3D Blast'' in terms of gameplay and story, it does experiment with a similar style of pre-rendered 3D graphics. This title applies said graphical style to a sidescrolling 2D platformer more in line with previous ''Sonic'' adventures. In addition to Sonic, ''Blast'' is the first platformer on the Game Gear to allow the player to control Knuckles, who comes with his signature gliding and climbing abilities. The game is unusual in that the amount of rings one loses from a hit varies from 10 to 30 depending on the source of damage.

The game can be found on ''VideoGame/SonicAdventure DX'' and ''Sonic Mega Collection Plus'', as an unlockable demo on ''Sonic Gems Collection'', and as DLC for ''Sonic Origins Plus''.

Not to be confused with ''VideoGame/{{Sonic 3D Blast}}'' aka ''Sonic 3D: Flickies' Island'' (although the two were marketed alongside each other). Nor ''VideoGame/SonicRoboBlast2''. Nor ''VideoGame/SonicBlastMan''. Nor the UsefulNotes/{{NES}} hack ''Sonic 3D Blast 5''.

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!!Tropes:
* AdvancingWallOfDoom: At some parts of Silver Castle, spiked walls will chase after you.
* AllInTheManual: The Japanese manual slightly elaborates on the plot by making it so that the plot is kicked off by Robotnik (while trying to shoot Sonic with a laser beam while he's snoozing in his hammock) accidentally blasting a nearby Chaos Emerald into five smaller pieces (explaining why you only collect five Chaos Emeralds instead of the six seen in other 8-bit games). Unexpectedly pleased by this unplanned turn of events, Robotnik impulsively wants to collect them to power up his new Silver Castle base. Knuckles, who sees the event play out, offers to help Sonic defeat Robotnik.
* AmericanKirbyIsHardcore: Referenced in the western manual, which mentions Robotnik's mustache as depicted in the western-version box art of all games at the time[[note]]Barring ''VideoGame/SonicTripleTrouble'' and the Game Gear version of ''VideoGame/SonicSpinball'', which instead depict him like in ''WesternAnimation/AdventuresOfSonicTheHedgehog''.[[/note]].
* AntiFrustrationFeatures: The TrueFinalBoss gives you 99 rings off the bat so you can have some fighting chance against it, which is good because you're going to need every single one of them for it!
* AttractMode: Leaving the title screen alone will show short demos of the game's first two acts with Sonic and Knuckles respectively, demonstrating their distinct abilities (Sonic's double jump, Knuckles' wall climbing/gliding).
* BeeAfraid: The Buzz Bomber-esque Badniks from Green Hill.
* BeneathTheEarth: Red Volcano Zone Acts 2 and 3.
* BonusStage: Acts 1 and 2 of each world have one, requiring the player to get 50 rings while running towards the background. Act 1's bonus stage giving you a 1-up for beating it, while Act 2's bonus stages will give you a Chaos Emerald for beating them.
* BossArenaIdiocy: The Silver Castle boss consists of Robotnik using mirrors to reflect lasers down at Sonic or Knuckles while they're stuck running on a giant wheel. Said wheel in question moves a third mirror around that can deflect said laser attack back at Robotnik, so the fight works a lot like a game of ''VideoGame/{{Pong}}''.
* BossOnlyLevel: As with the other Game Gear games, the third act of each Zone is a small platforming area and then a boss fight (this returns to the first game's MO by having Robotnik fight instead of his flunkies). Silver Castle Act 3 is an exception although none block the shortest route to the boss battle. The TrueFinalBoss is a separate part of the game from the Silver Castle boss, not even having a platforming section.
* BonusStageCollectibles: There are five Chaos Emeralds to collect, which can be acquired in Act 2 of each level by getting 50 rings, finding a Giant Ring and completing a bonus stage. Getting all five allows you to fight the TrueFinalBoss and get the Good Ending. Act 1 has Giant Rings and bonus stages as well, but the ones you find there will only reward you with a 1-up on completion.
* TheCameo: While Super Sonic is not playable, he does get a rare cameo as one of the top bonuses on the end-of-level goalposts. If you get his picture, it will grant you a 1-up and 30 more Rings. It's notably the ''only'' appearance of Super Sonic in the Game Gear Sonic games.
* ClassicCheatCode: There is a level select code that can be accessed at the title screen by pressing '''Up, Up, Up, Down, Down, Down, 1, 2, 1, 2''' (a chime will play if you entered it correctly) and then pressing start. You can access all of the levels this way, but skipping anywhere past the first act of Green Hill Zone [[NoFairCheating will make it impossible to get all of the Chaos Emeralds]], thus meaning you can't fight the TrueFinalBoss and thus get the good ending. And if you get a Game Over, you have to reset the game to put in the code again.
* CollapsingLair: Silver Castle crashes into the ocean in both endings.
* ConvectionSchmonvection: Red Volcano has Sonic and Knuckles traversing an active volcanic cavern mere inches over lava pits and fireballs, without any sign of harm unless they directly touch them. It's even more egregious with the pump-powered floating platforms, which look like they should start melting any moment.
* DoubleJump: Sonic has one in this game, which is referred to in the manual as the Sonic Boost Blast.
* DubInducedPlothole: The western storyline leaves out the part which explains why a Chaos Emerald spins around and splits in five[[note]][[AllThereInTheManual In the Japanese manual]], it happens as a result of Eggman trying to shoot a snoozing Sonic with a laser beam, but accidentally hitting a nearby Chaos Emerald instead. It gets broken into 5 pieces that fly off over the land, which leads to Eggman changing his plan to collecting the Emeralds to power up his new Silver Castle base.[[/note]], turning the opening sequence in which we see just that happen into a nicely-animated but particularly odd moment.
* EternalEngine: Silver Castle Zone, which from the outside is very similar to the Death Egg in appearance, and inside is similar to Scrap Brain Zone.
* {{Expy}}: Almost all of the levels are based on or are similar to levels from previous Sonic games.
** Green Hill Zone is a mashup of, obviously, [[VideoGame/SonicTheHedgehog1 Green Hill Zone]], along with [[VideoGame/SonicTheHedgehog2 Emerald Hill Zone]] while having similar setpieces to [[VideoGame/SonicTripleTrouble Turquoise Hill Zone]] and [[VideoGame/SonicTheHedgehogCD Palmtree Panic]].
** Yellow Desert is obviously based on [[VideoGame/Sonic3AndKnuckles Sandopolis.]]
** Red Volcano is based on [[VideoGame/Sonic3AndKnuckles Lava Reef]] and [[VideoGame/Sonic3DBlast Volcano Valley.]]
** Blue Marine is similar to [[VideoGame/SonicTheHedgehog2 Aquatic Ruin Zone]] with elements of [[VideoGame/SonicTheHedgehog1 Labyrinth Zone]] sandwiched in.
** Silver Castle's exterior is identical to the [[VideoGame/Sonic3AndKnuckles Death Egg]], although the inner level design and setpieces are more like [[VideoGame/SonicTheHedgehog1 Scrap Brain Zone]] and [[VideoGame/SonicTheHedgehog2 Metropolis Zone]].
* ExcusePlot: The game follows the typical barebone "Eggman is up to no good, and Sonic (or Knuckles) has to save the day" story. The Japanese story slightly elaborates on it by making it so that the plot is kicked off by Robotnik (while trying to shoot Sonic with a laser beam while he's snoozing in his hammock) accidentally blasting a nearby Chaos Emerald into five smaller pieces. Unexpectedly pleased by this unplanned turn of events, Robotnik impulsively wants to collect them to power up his new Silver Castle base. Knuckles, who sees the event play out, offers to help Sonic defeat Robotnik.
* FakeDifficulty: What little challenge the game has comes from this due to the cramped level design combined with the huge sprites and wonky hit detection, the limited view of what's up ahead and the fact that you have zero room for failure when it comes to the Chaos Emerald sidequest; lose at any of the Act 2 Special Stages even ''once'', and you're locked out of the TrueFinalBoss and Good Ending. Playing as [[BonusFeatureFailure Knuckles]] adds more due to his low jump height and his gliding ability being nerfed to the point where he covers practically no distance, and can't even damage enemies by gliding into them anymore.
* GreenHillZone: The TropeNamer makes an appearance in this game, although it has little in common with the original level outside of a superficial resemblance, but has shades of ''Sonic CD'''s PalmtreePanic in it as well.
* GoldenEnding: While both endings are more-or-less identical, the real ending doesn't show Robotnik escaping from the Silver Castle, and has a brief additional bit of your character triumphantly juggling the Emeralds.
* HitboxDissonance: The hit detection in this game is all over the place. The enemies notably have much bigger hitboxes than their small sprites let on.
* HoppingMachine: Robotnik's device in the third act of Red Volcano is this coming off the bottom of the screen, with a ball and chain used as its method of attack.
* IdleAnimation: Leave Sonic or Knuckles standing around, and they'll do their own distinct idle animations. Sonic will glance at the player and motion with his finger to get on the move, while Knuckles shadow-boxes in place.
* InCaseOfBossFightBreakGlass: Robotnik's boss fights in this game are unusual among the Game Gear games in that his machines only take damage if Sonic or Knuckles attack the glass dome with the Doctor inside. Hitting the boss anywhere else won't get you very far.
* InNameOnly: Aside from being a Sonic the Hedgehog game with 3D rendered graphics, ''Sonic Blast'' has ''nothing'' in common with ''Sonic '''3D''' Blast'' on the Genesis, Saturn, and PC. However, as these games came out around the same time, they were marketed together in advertising, as if ''Sonic Blast'' was the handheld port, where the earlier ''Sonic Labyrinth'' had more in common with ''3D Blast''.
* JetPack: Dr. Robotnik uses one in the "fail a bonus stage" cutscene, flying by to swipe the 1-up (Act 1) or Chaos Emerald (Act 2) from right from in front of Sonic or Knuckles if they don't get enough Rings.
* JokeCharacter: Knuckles is, to be frank, [[BonusFeatureFailure as useless as a man's nipple in this game]]. The levels are clearly designed with Sonic in mind and there are few opportunities for Knuckles to truly take advantage of his gliding and wall climbing abilities. And even then, Knuckles' glide has been ''heavily'' nerfed to where he can barely fly any distance at all with it, sinks like a rock in the air and can only turn around mid-air slowly. His climbing is as slow as molasses, and trying to use the glide often can actually make the game harder because of the small screen resolution combined with offscreen enemies that Knuckles can accidentally buffet into... oh, and did we mention he can't hurt enemies by gliding into them in this game[[note]]With the odd exception of, ironically, Robotnik himself during boss fights[[/note]] any more? On top of that, Knuckles' rotten jump height means he can't reach some areas Sonic can, and some of these areas ''can't'' be accessed by either wall climbing or gliding -- at least without sometimes risking getting hurt in the latter's case -- which defeats the whole purpose of using the abilities (and thus, Knuckles himself) anyway.
* JokeItem: The Robotnik monitor, which, unlike its ''Sonic 2''/''Sonic 3 & Knuckles'' counterpart that hurts you, instead reduces your time limit by a bit; not that you're aware, since it isn't displayed on-screen.
* KaizoTrap: The timer for running out of air never stops during [[UnderwaterBossBattle Blue Marine's boss encounter]], so it's entirely possible to drown immediately after you've defeated Robotnik's submarine. If that happens, you have to fight it all over again; even if you were in the victory pose.
* KillSat: Silver Castle is presumably this, due to its similar appearance to the Death Egg.
* LaterInstallmentWeirdness: It's the final ''Sonic'' game for the Game Gear, and has some differences from the games that came before.
** Knuckles makes his first and only appearance as a playable character in a Game Gear platformer.
** This is the only Game Gear ''Sonic'' title to make use of pre-rendered 3D graphics. All the others used hand-drawn sprites.
* LawOfOneHundred: Collecting 100 rings gets you a free 1-up... but seemingly resets your ring counter back to zero. The game's [=HUD=] doesn't go past 100 rings, but will still count them as such.
* LethalLavaLand: Red Volcano Zone Act 1.
* LongSongShortScene: [[https://www.youtube.com/watch?v=MmY47pZ5R88 The music for the game's opening cutscene]] is 33 seconds long, but the actual opening cutscene is only six seconds long. This implies that the game was originally going to have a longer opening cutscene, but due to either time constraints or hardware limitations, it had to be reduced to six seconds.
* MarathonLevel: Blue Marine Act 2 is the longest level in the game and among the hardest too.
* MechaMooks: 13 different types appear throughout the game.
** Green Hill Zone has bee robots that resemble Buzzers, which fly through the air and occasionally shoot at you. Coconuts and Masher-like badniks are present too.
** Yellow Desert Zone has unnamed badniks that slide around and stick a spike out of their heads as well as Batbot/Halogen enemies that simply fly around.
** Red Volcano has Rexons and Gohla like enemies (though unlike their Sonic 2 versions, they won't change direction and only have one flame circling them respectively).
** Blue Marine Zone has Crabmeat like enemies that slowly move back and forth, but won't attack the player. An Aquis enemy (a seahorse like badnik) also pops up and can shoot projectiles at you. They also have Octopus enemies that float around in the water and only "attack" through collision damage.
** Silver Castle Zone has a trio of enemies collectively called Egg Saucers. One flies around with a saw like blade, another has a cannon in its chest, and the third bounces in place on a spring.
* NoFairCheating: Using the level select cheat code to skip anywhere beyond Green Hill Zone Act 2 will keep you from getting all of the Chaos Emeralds and thus prevents you from fighting the TrueFinalBoss and getting the GoodEnding.
* NonIndicativeName:
** Red Volcano has more of a purple-pinkish color palette than red.
** Silver Castle, while indeed large and chrome in appearance, looks absolutely nothing like a castle [[EternalEngine inside]] or [[KillSat out.]] It's possible the "castle" part is meant to be metaphorical, in the same way the Boeing B-17 Flying Fortress isn't a literal flying fortified building.
* OxygenMeter: The timer now counts down from 9 seconds instead of 5 when close to drowning. Unique to this game and this game only, after the countdown hits 0, all of your rings are rapidly drained away, drowning you as soon as ''they'' hit 0, instead.
* OxygenatedUnderwaterBubbles: In Blue Marine Zone. Though, if you can't find any nearby bubbles -- and often, you can't -- jumping into a pipe has the same effect if needed.
* PermanentlyMissableContent: Only one Chaos Emerald can be collected per zone, and you only get one shot at getting each one in the second act of each; otherwise, Robotnik flies by with a jetpack to steal it, and you're locked out of the TrueFinalBoss and Good Ending. Ergo, if you slip up on any of them, you'll have to replay the entire game in order to get a shot at collecting all five Chaos Emeralds.
* PowerUpLetdown: The speed-up shoes do exist in the game and they do make Sonic or Knuckles go somewhat faster, but they only appear once early in Act 2 of Yellow Desert. Said level is cramped and full of chances for you to run into a just off-screen wall and thus lose your momentum and stop dead in your tracks. And to add insult to injury, the speed-up effect lasts roughly 10 to 15 seconds.
* QuicksandSucks: Featured in Yellow Desert Zone Act 2.
* ScreenCrunch: The Game Gear version has a smaller screensize than the Sega Master System. However, the gameplay side effects appear on the Sega Master System version, as the game's boss battles expect a smaller screensize.
* ShiftingSandLand: Yellow Desert Zone Act 1, a small sandy area set around some ancient ruins.
* ShoutOut:
** Robotnik's flying machine from the Green Hill Zone boss fight looks very similar to Opa-Opa's ship design from ''VideoGame/FantasyZone''.
** The Yellow Desert Zone boss fight has Robotnik's mech patterned after Sun Wukong, a character from the Chinese epic ''Literature/JourneyToTheWest''.
* SingleUseShield: The standard shield power-up is present for this game, but due to graphical limitations its presented as two sparks circling Sonic or Knuckles.
* SpritePolygonMix: Pre-rendered 3-D models for Sonic, Knuckles, Robotnik -- as well as his boss machines -- and the Badniks, but 2-D sprites for everything else.
* TempleOfDoom: Yellow Desert Zone Acts 2 and 3, which take place [[BuildLikeAnEgyptian inside a pyramid]].
* TennisBoss: Silver Castle Zone.
* ThemeNaming: Each of the five worlds is named after a color: '''Green''' Hill Zone, '''Yellow''' Desert Zone, '''Red''' Volcano Zone, '''Blue''' Marine Zone, and '''Silver''' Castle Zone. In particular, these are the colours of the Chaos Emeralds -- green, yellow, red, blue and white -- that you can respectively get in each one.
* TimedMission: Each stage has a ten-minute time limit. However, you wouldn't know this unless you paid attention to the pre-stage introductions, as there's no clock in the game's HUD. During the last 30 seconds of the time limit, the words '''[[StalkedByTheBell HURRY UP!]]''' appear onscreen and the music becomes more frantic. Then, during the last ten seconds, '''HURRY UP!''' appears onscreen three more times, and the last ten seconds tick away before Sonic or Knuckles loses a life.
* TrueFinalBoss: Depending on whether you have all the Emeralds or not by the time you beat Silver Castle's boss, you immediately confront the real final boss.
* UnderwaterBossBattle: Blue Marine Zone. Extra air is only provided by Robotnik's submarine firing a harpoon into the ground, which causes a bubble to rise up that the player ''must'' take advantage of to avoid drowning.
* UnderwaterRuins: Blue Marine Zone.
* VillainExitStageLeft: Robotnik flees Silver Castle when it crashes into the ocean in the BadEnding, but doesn't in the GoodEnding.
* VisualPun: The true final boss is, of all things, a cracked egg.
* WarmUpBoss: The Green Hill Zone boss, where Eggman just launches a razor-edged boomerang at you while he floats in place and occasionally changes position. Predictably, his attack is easy to dodge and he can go down in seconds just by attacking relentlessly.
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