[[caption-width-right:290:Bangai-O GO!]]

An action/{{Shoot Em Up}}/{{Bullet Hell}} (sometimes) game series made by Creator/{{Treasure}}, consisting of 3 games: ''Bangai-O'' on the [[UsefulNotes/Nintendo64 N64]] ([[NoExportForYou only in Japan]]) and the UsefulNotes/SegaDreamcast, ''Bangai-O: Spirits'' on the [[UsefulNotes/NintendoDS DS]], and ''Bangai-O: Missile Fury'' on XboxLiveArcade. The N64 version had a limited run of about 10,000 copies, which makes it incredibly rare (and correspondingly [[CrackIsCheaper incredibly expensive]]). The Dreamcast version was later released worldwide and is much more common.

''Bangai-O'' is split into levels, and the goal of most of them is to run, shoot, fly, slash, dodge, shoot, and shoot (did we say shoot?) anything in your path until you destroy the targets of the level. ''Bangai-O'' is rather customizable, with ''Spirits'' allowing you to choose 2 of 8 or so missile types at a time and mixing or splitting them as needed. In addition to regular missiles, Bangai-O can perform an EX attack, which is a more powerful version of the regular missiles(EX attacks do not have to be the same missile types as your standard missiles).

''Bangai-O'' follows the [[ExcusePlot story]] of Riki and his sister Mami as they pilot [[GiantMecha Bangai-O]] against the Cosmo Gang, punishing them for the nefarious crime of...[[FelonyMisdemeanor fruit contraband.]] What little story there is is told between missions or with dialogue during missions.

''Bangai-O Spirits'' features the titular mecha from the first game, but the pilots have changed, to Masoto and Ruri, who are visually expies of Riki and Mami. Spirits decides to ignore the concept of a plot at all, and the only dialogue is during the tutorial, after which you'll never see the pilots' faces again...unless you manage to beat a certain set of stages. At which point they come out to announce they only appear because the fanboys would throw a fit. Spirits features local multiplayer and a nice level editor, as well as a rather odd way of sharing custom levels...They're encoded in short [[http://l.j-factor.com/bangai-o/soundload.wav sound files]] which are played into the DS's microphone.

An Xbox360 version by the name of ''Bangai-O: Missile Fury'' was released via the Xbox Live Arcade on May 4. It, so far, does not have the slowdown that the Dreamcast experienced despite having around 5000 moving things on-screen. It also has a level editor (like ''Spirits'') and multiplayer (the latter being the reason why it wasn't released at the previously announced date of November 2010 - After [[Webcomic/PennyArcade PAX 2010]], they took one of the comments of a player wondering about the possibility of multiplayer and added it in.)

!!''Bangai-O'' provides examples of the following tropes:

* AWinnerIsYou: Discussed in the ending of ''Spirits'', where the characters state that the ending only exists to avoid pissing off players who would otherwise complain about a bare-bones ending.
* AIBreaker: As hard as it gets at times, ''Missile Fury'' actually added a decent combo to safely take down most of the enemies, provided you can use both dash guage abilities. Dash in, freeze-to-cancel, shoot, freeze-to cancel, shoot while retreating, dodge for 3 seconds. Not even Longai-O is safe from this. It does, however, require practice to pull off effectively (particularly against the stage 47 boss, [[spoiler:Crazy King]]).
* AntiFrustrationFeatures: In ''Missile Fury's'' Fury mode, stages are unlocked one at a time. Failing a stage 3 times will unlock the next one automatically.
* ArtShift: Done with the non-gameplay character art for each installment, oddly enough. ''Spirits'' replaced designer HAN's iconic style with a modern anime aesthetic, while ''Missile Fury'' went in favor of a detailed and sketchy look.
* AsLongAsItSoundsForeign: Taken to its (il)logical extremes. There's a character that speaks in nothing but ''pictures''.
* BatterUp: Spirits introduces a bat, which you can use to knock back missiles and send robots flying.
* BeamSpam:
** In ''Bangai-O'', Mami's mech does this. They rebound off the walls and then target enemies after bouncing.
** Unfortunately, some of the {{Mirror Boss}}es can do it as well.
* BlindIdiotTranslation: The Dreamcast and N64 versions. TropesAreNotBad, though, the broken {{Engrish}} is a major part of its charm, and a FountainOfMemes.
* BossInMookClothing: Longai-O in ''Bangai-O Spirits''. It's effectively impossible to defeat one without the use of EX attacks (It'll [[TheComputerIsACheatingBastard endlessly]] counter with EX Missile to avoid damage). It's telling that the only reliable method to beat Longai-O in ''Spirits'' is to sacrifice your EX Weapon linking and slot in Reflect to instant-kill him when he does a 4X counter.
* BossOnlyLevel: The first game has the duel with [[GoldfishPoopGang Sabu]] in level 26. There are no enemies at all, with the only obstacles being falling block generators.
* BreakingTheFourthWall:
** The ending to ''Spirits'', which the pilots say only exists because fanboys would throw a fit otherwise. They then discourage you to just hock the game off at a used game store by encouraging you to make and download custom stages.
** Also, this is frequently displayed in the original, with Riki, Mami and [[ExpositionFairy Mrs. M]]. Even a few bosses show some degree of it (with one [[MirrorBoss Mirror Boss]] having the intent of [[HostileShowTakeover killing and replacing Riki as the star]]).
* {{Cap}}:
** EX Attacks in the N64 and Dreamcast versions were capped to 400 projectiles. ''Missile Fury'' raises this to 1000.
** In ''Spirits'', this was changed to where linkable EX Attacks (Homing, Bounce, Break, etc.) would fire a maximum of 100 projectiles, but you could increase the size and damage up to 4X. The counter for reflect is capped to 999, [[UpToEleven but you can actually reflect MORE than that in very certain conditions.]]
* CatchPhrase: Bangai-O, GO!
* ChargedAttack: EX attacks.
* {{Cloudcuckoolander}}: There are several of these, although Koa-Zo/Core Boy is arguably the most notable one; conversations with him consist entirely of his monologuing, and he once infamously claims that he is a [[{{Kitsune}} fox]].
* {{Engrish}}: A metric ton of it in the Dreamcast version, at least. [[IntentionalEngrishForFunny May have been intentional]], it greatly enhances the [[WidgetSeries widget]] factor, which is a ''good'' thing here.
* EvilTwin: Complete with their own EX attacks, resulting in a dual of MacrossMissileMassacre. The last boss in Bangai-O even uses the Invincibility item.
* ExcusePlot: ''Bangai-O Spirits'' [[AvertedTrope doesn't even offer a plot to players]], leading them to wonder why they're blowing up random robots and collecting fruit. The UsefulNotes/{{Nintendo 64}} and UsefulNotes/SegaDreamcast releases weren't much better off, playing it straight.
* FinalBossPreview: ''Bangai-O'' subverts this (somewhat) by having you fight ''and'' beat him in [[HolyShitQuotient level 19]]! The best part? The actual final boss fight is even tougher.
* GiantSpaceFleaFromNowhere: Most of the bosses in ''Bangai-O'' have nothing to do with the Cosmo Gang. Luckily, almost all of them [[AllThereInTheManual are covered in the manual]].
* GlowingEyesOfDoom: Masoto has one underneath his PeekABangs in ''Spirits''. For no apparent reason.
* GoldfishPoopGang: Sabu in ''Bangai-O''. While he gets slightly harder to defeat in each encounter, he's not that difficult compared to several bosses.
* HitboxDissonance: The {{Bat|terUp}} weapon in ''Spirits'' has a hitbox that is longer than the reach of the bat by a few pixels.
* HopelessBossFight: Inverted, one series of bosses don't attack and sit there helplessly. It's basically impossible to lose these fights.
* HomeRunHitter: The alternate close combat weapon in ''Spirits'' (aside from the LaserBlade) is a mecha-sized baseball bat that sends enemies (and any baseballs, basketballs, and soccer balls that happen to be lying around) flying.
* HumanAliens: In the first entry, at least.
* HumongousMecha: Bangai-O, of course. Then again, depending on how you scale enemies and buildings in the level editor, it might not be so humongous. If a title card is to be trusted, it runs off vegetable oil. [[ItRunsOnNonsensoleum No, really]].
* LaughingMad: ''Spirits'' ends every victory (or Game Over) with a maniacal laughter, almost as if to celebrate the game's madness whether you win or lose.
* LevelEditor: ''Spirits'' includes an extremely flexible editor that can be accessed while a level is playing. This is available even in every official level, complete with debug functions like invincibility and frame-advance, [[NoFairCheating but using them disables record saving]]. ''Missile Fury'' also has one, but it lacks the debug features of ''Spirits''.
* LimitBreak / DesperationAttack: MAX ATTACK in ''Missile Fury'' gives you 4X-sized bullets for all your attacks and ignores the dash guage for the duration of it. The catch? First, you have to have 5 EX attacks saved up to use it. Second, when the EX guage bottoms out (or when you use an EX Counter attack), Both the EX guage and the Dash guage get reset to 0 and you become stunned for a period of time. Lastly, some stages disable it, either explicitly or by capping the EX guage to 4.
* MacrossMissileMassacre:
** With EX attacks, it's possible to use so many missiles at one time that the DS will actually freeze for a few seconds before resuming (albeit with plenty of lag until some missiles disappear off-screen). [[RuleOfCool That's not so much a freeze as an intentional pause that gets longer in relation to the size and number of missiles that you launch.]]
** In the [[UsefulNotes/SegaDreamcast Dreamcast]] and [[UsefulNotes/{{Nintendo 64}} N64]] versions, you can release up to 400 individual missiles. In the Dreamcast version, each missile had its own vapor trail and would occasionally slow down due to lag when tons of crap are blowing up. It's an awesome side effect when it happens.
** This is [[UpToEleven increased to 1000 without the hardware lag]] in ''Missile Fury'' for ALL EX attacks. This is more than any EX Attack in any of the other versions - even the borderline [[GameBreaker Game-Breaking]] Reflect Attack in ''Spirits'' only gets up to 999 under very specific conditions.
* MarathonLevel: More than possible to make in ''Spirits'', and ''Missile Fury'' increased the maximum size of levels. 1 screen tall by 64 screens wide (or an 8x8 square) is the limit in the latter.
* MirrorBoss:
** Some bosses are essentially Bangai-O clones (missiles) with all the abilities. Hell, the final boss in the first game goes ''invulnerable'' using the same power as the heroes do.
** ''Spirits'' gives the dark Bangai-O clone a name: Longai-O. ''Missile Fury'' adds a second clone: [[spoiler:Crazy King]]
* MoreDakka
* NintendoHard:
** The tutorial for ''Spirits'' concludes by telling you how to turn on the invincibility cheat. That should give you an idea of what you're going up against. And the last mission is pretty damn hard.
** ''Missile Fury'' ramps it up: You can die in seconds on the very first stage if you don't know what you're doing.
* NoPlotNoProblem: There is literally no story in ''Spirits'' once the tutorial ends. It's just a bunch of unconnected levels with high scores and best times waiting to be taken. ''Missile Fury'' doesn't even have that.
* OnlySixFaces: Parodied to hell with one boss who is fought several times. The heroes recognize him. He doesn't.
* ShoutOut: A few. The title itself is one to ''Anime/{{Dangaioh}}''.
* StuffBlowingUp: Yeeeeesssss... So much so that in ''Spirits'', there is an actual "BOMB" counter in the top right corner of the bottom screen which counts the number of explosions that are occurring in the entire stage at any given time. The tutorial even notes that not all of the explosions will be rendered if too many happen at once due to the technical limitations of the DS (to say nothing of the lag), so sometimes you'll have to go by that number if you want the bonuses associated with proximity to bombs.
* TakeThatAudience: The ending of ''Spirits''[='=]s "Treasure's Best" stages levels a few insults to players who complain about games with [[AWinnerIsYou minimal endings]] as well as players [[ItsShortSoItSucks who complain about short games]], while encouraging the player to try out the LevelEditor and to try out other players' stages.
* TennisBoss: In most cases, Longai-O. It typically goes like this: Approach Longai-O with full EX guage (3), fire shots, Longai-O counters with EX Missiles, you counter with 2X attack, Longai-O counters with [[{{Cap}} 100 4X EX missiles]], you counter with [[GameBreaker Reflect]], Longai-O dies instantly.
* TimedMission: Present in ''Missile Fury'' -- one of the early ones is a 30-second rush to destroy all enemies.
* WidgetSeries: Character interactions in the game are completely bonkers. [[ExcusePlot Not that it really matters too much.]]
* AWinnerIsYou: Lampshaded in ''Spirits''.