[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/250px-udcoverfront_p_7604.jpg]]
[[caption-width-right:250:Featuring tilting helicopters and a [[PuttingOnTheReich Nazi-esque]] [[TheEmpire Empire]] as the forces of ''good''.]]
'''''Under Defeat''''' is a VerticalScrollingShooter by G.rev, the same development team behind ''VideoGame/BorderDown'' and the ''VideoGame/SenkoNoRonde'' series. It was released for arcades in 2005 on the Sega NAOMI hardware, ported to Platform/SegaDreamcast in 2006, and ported to additional platforms from 2012 through 2014.

The Empire and the Union are in the midst of a long-standing war, and it seems that a ceasefire is to take place soon. However, just days before the ceasefire, the Union prepares new weapons and gears up for more combat, forcing the Empire to fight back.
%% Will need further elaboration; this is based on the English 360 port.

The game plays like a typical vertical shooter with 3D graphics and a tilted perspective, with a few twists. When not firing, you can tilt your helicopter up to about 30 degrees in either direction to fire at offset directions. You also have an Option that can be [[ChargedAttack charged up]] by releasing the fire button and letting the Option gauge fill up, at which point the Option will seek out and fire at targets for bonus points; your Option can alternate between three different types (gun, cannon, rocket) through powerups.

In 2012, G.rev released ''Under Defeat HD'' on Platform/PlayStation3 and Platform/XBox360. ''Under Defeat HD'' is an UpdatedRerelease featuring a new mode, the New Order mode, which uses a 16:9 game window, adds a few more tweaks such as dual-analog controls, and features an arranged soundtrack. ''Under Defeat HD'' was released in Japan, the United Kingdom, and North America (on [=PS3=] only) in 2012, throughout the rest of Europe in 2013, and in North America on Xbox Games on Demand in 2014.
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!! ''Under Defeat'' provides examples of the following:
* TwoAndAHalfD: Helicopter movement (relative to the screen) is in two dimensions, but visuals are rendered in 3D. Additionally, shots from ground targets take time to reach your altitude, and your center gun will adjust to hit targets on the ground.
* TheAlliance: The Union. Unusually, the Union serves as an antagonist force.
* ArcadePerfectPort:
** The Dreamcast port, naturally, as the Dreamcast's hardware matches the Sega NAOMI's.
** The same cannot be said for the HD ports in arcade mode; while they are mostly are mostly accurate, there are some differences such as timing differences in enemy appearances and attacks, as well as a wealth of slowdown on the FinalBoss not seen in the NAOMI or Dreamcast versions, especially with the game in vertical-monitor mode.
* BattleshipRaid: There are several battleships in Stage 2, but the most notable one is the massive boss battleship that serves as the boss.
* {{Cap}}: You can have up to six bombs; collecting excess bombs will grant you 10,000 points each.
* ChargedAttack: The Option is charged up by releasing the fire button until the gauge fills up with green, and then firing again. After the Option is either shot down or runs out of ammunition, it has a cool down period before it can be charged up again.
* DynamicDifficulty: The game has a "rank" system, but how it works is [[GuideDangIt largely a mystery]] to even experienced players.
* TheEmpire: [[ExactlyWhatItSaysOnTheTin The Empire]]. Unusually, you play as plots hailing from it.
* {{Expy}}:
** The Empire is a stand-in for Nazi Germany, with the pilots' uniforms and use of German reflecting this.
** The Union is a fusion of UsefulNotes/WorldWarII Allied and non-German Axis powers.
* GoodRepublicEvilEmpire: ''Inverted''. This time, the Union are the ''bad guys'' while the Empire is ''good''.
* HardModeFiller: Complete all five stages with an average Contribution rating of 95% or higher to access the second loop.
* LongSongShortScene:
** The arranged versions of the original tracks have extra sections, and most likely in a given stage you won't get to hear the whole track unless you pause the game.
** The New Order stage 1 track, "Don't look back!", has a breakdown section at the end of the track that is not heard if, again, you don't pause the game, even if you time out the endboss.
* NintendoHard: It's an UsefulNotes/ArcadeGame, so it has to be. And since you don't get extra lives, there is not much room for error.
* OneUp: Averted. There are ''no'' extra lives at all, so make every last life count!
* PuttingOnTheReich: The Empire is effectively the Nazis in all but name. In a twist on this trope, you're fighting ''for'' the Empire.
* ScoringPoints: In addition to the standard "kill enemies for points" formula, there are a few gimmicks. More information can be found [[http://shmups.system11.org/viewtopic.php?t=28590 here]], but here's the gist of it:
** Destroying an enemy with your Option doubles the point value of that enemy.
** At the end of each stage, you get some bonuses: the "Contribution" bonus for destroying specific targets within the stage, the timer bonus, and the bombs remaining bonus.
* SilenceIsGolden: Stage 5, which is [[spoiler:the ruins of a major city]], begins with a somber track and no sound effects, before the track picks up and the sound effects come back.
* SmartBomb: Three per life, with more obtainable through bomb pickups.
* TankGoodness: A large plurality of enemies, especially ground enemies, comprise tanks.
* ThisIsNotADrill: Spoken verbatim by a loudspeaker in Stage 2, as an order to Union forces:
--> "Enemy attack! Battle stations, battle stations! All hands to battle stations! This is not a drill! I say again: This is not a drill!"
* TimeLimitBoss: Each boss is on a timer. You get 1,000 points for each whole second left on the timer when the boss is defeated. Timing out the boss will cause it to self-destruct, but you'll get no bonus.
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