[[caption-width-right:250:From top to bottom: ''VideoGame/SuperMarioBros3'', ''VideoGame/HeavyWeapon'', ''VideoGame/ShadowComplex'', ''VideoGame/SuperMario3DWorld''.]]

Stand to attention, player! You're not in GreenHillZone any more! This [[VideogameSettings videogame setting]] suddenly has a lot of guns, bombs, [[TankGoodness tanks]], warships, soldiers, barbed wire, trenches, smoke, and mines, often in stark contrast to the rest of the game. Often seen in platformers to mix up the usual mix of generic level types.

The music will generally switch to a more sinister theme to warn you, if not a straight out military marching tune.

Don't be surprised to see SchizoTech, SuperSoldier enemies, a MilitaryMashupMachine for a boss, and for the battlefield to resemble {{Mordor}}. Compare BattleshipRaid.

!! Examples:

* ''Franchise/SuperMarioBros'':
** The tank parade and warships of the Dark World in ''VideoGame/SuperMarioBros3''.
** A subversion is Bob-omb Battlefield in ''VideoGame/SuperMario64'', which contains references to a war between two groups of Bob-ombs, but the only actual fighting seen is when the Bob-ombs on the mountain shoot bubble cannons at Mario in the first episode. After that (and even before it), it's more of a pretty standard GreenHillZone.
** Wario's Battle Canyon from ''VideoGame/MarioParty.''
** ''VideoGame/SuperMarioGalaxy'' and ''VideoGame/SuperMarioGalaxy2'' have both several examples of this, which become [[ThatOneLevel Difficult to tackle]] when it comes time to collect Purple Coins in them (except the Bowser and Bowser Jr. levels, which only have 1 star each in the first game and 2 in the second).
** ''VideoGame/SuperMario3DWorld'' has [[AddedAlliterativeAppeal Bowser's Bullet Bill Brigade]] and several other levels, which feature goosestepping {{Mooks}} and also see the return of the tanks from ''Super Mario Bros. 3''.
** ''VideoGame/SuperMario3DLand'' and ''Super Mario Bros. 3'', among others, combine this with LevelsTakeFlight in the form of airship levels, which see Mario take on Bowser's air force.
* The final regular level of Gnasty's World in ''VideoGame/SpyroTheDragon'', Twilight Harbor.
** The Peace Keepers Home has background music that sounds like a military march, the enemies are old-fashioned soldiers, and there are some cannons sitting around that can be fired. None of the actual Peace Keeper worlds continue this trope, though.
** The Zephyr stage from ''Ripto's Rage!''/''Gateway to Glimmer'' features the war betwen the Breeze Builders and Land Blubbers. The main goal of the level is to capture an enemy building.
* The ''SonicTheHedgehog'' games use this every now and then.
** Huge Crisis Zone in ''{{VideoGame/Sonic Rush|Series}}''.
** Secret Base Base Zone in ''{{Sonic Advance|Trilogy}}''.
** [[AirborneAircraftCarrier Wing Fortress Zone]] in ''VideoGame/SonicTheHedgehog2''.
** [[AirborneAircraftCarrier Flying Battery Zone]] in ''VideoGame/Sonic3AndKnuckles''.
** ''VideoGame/SonicAdventure2'''s Prison Island portion is big on this one. Metal Harbor, Weapons Bed, Security Hall, Iron Gate, and Prison Lane all fall under this trope. The first two take place on the island's G.U.N. naval base (Sonic even climbs up an ICBM launch pad and [[CrazyAwesome hitches a ride on the missile]]); the other three are more accurately within the TheAlcatraz trope. They are in a top-secret military-level prison, however...
** Most ''ShadowTheHedgehog'' levels have this in one way or another. Central City, Westopolis, Prison Island, G.U.N. Fortress and [[AirborneAircraftCarrier Air Fleet]] are probably the most applicable to this trope.
** Sweet Mountain in ''VideoGame/SonicColors''... and it's made out of [[LevelAte FOOD]].
* The Rikti War Zone in ''CityOfHeroes''. Also the Shadow Shard, [[ScrappyLevel though not as well known for it...]]
* Warcadia in ''VideoGame/{{Folklore}}''. Particularly noticeable since you head there directly from [[{{Arcadia}} the Faery Realm]], a [[ExactlyWhatItSaysOnTheTin fairyland filled with friendly little elves, breathtaking architecture, and lots of big, green trees]]. Whereas Warcadia is filled with monsters based on soldiers and WWII-era weapons, craters, burning buildings and at least one MilitaryMashupMachine.
* When the Army comes in ''VideoGame/HalfLife1'', and some places of ''VideoGame/HalfLife2''.
* The War levels of ''MischiefMakers'' had lots of tanks and bombs. You even rode a missile at one point!
* The very first level in ''VideoGame/{{Psychonauts}}'', Basic Braining. You're [[JourneyToTheCenterOfTheMind in the mind of your coach]], who is obsessed with the military, and thus everything in his mind that you can see so far is war, war, war. Explosions, war-themed figments, minefields, cannons, camouflage. Even the trees are made of bullets and the [[{{Foreshadowing}} rabbits]] are wearing soldier's helmets.
* The Kingdom of Anger, Volk, from ''VideoGame/{{Klonoa}} 2: Lunatea's Veil'', a kingdom consisting entirely of people who do nothing but fight ''all the time''.
* The War chapter of ''VideoGame/ConkersBadFurDay''
* Technoir in ''VideoGame/JazzJackrabbit''.
* Napalm Man from ''VideoGame/MegaMan5'' has this for the second half of his stage.
* The aptly named Planet Batalia in ''RatchetAndClank'' (the first one).
* All ''Franchise/MetalGear'' games feature these prominently, of course.
** And thus, Shadow Moses in ''SuperSmashBros Brawl''
* Sometimes {{Inverted}} in ''MetalSlug'': while the game is about (at times wacky) war, some areas have little to no killing machines trying to kill you. Of course, there are always ''something else'' [[EverythingTryingToKillYou trying to kill you]]...
* Military base in ''{{Painkiller}}''.
* Moon Kronor in ''SeriousSam II''.
* Planet Norion and Pirate Homeworld in ''VideoGame/MetroidPrime 3''.
* Ichor in ''VideoGame/JetForceGemini''.
* World 2 ("Combat Island") in ''VideoGame/RainbowIslands''. With cute, cartoony-looking bomber planes and tanks, no less.
* Pretty much ALL the levels in ''HeavyWeapon'' are like this.
* The Halberd in the {{Kirby}} series. Meta Knight's airship is probably the biggest example of MoodWhiplash in the series that doesn't involve a CosmicHorror.
* [[DeathWorld Planet Helghan]] from ''VideoGame/{{Killzone}}'' looks like this beside all the other stages in ''VideoGame/PlaystationAllStarsBattleRoyale'' (at least until it gets invaded by ''VideoGame/ApeEscape'''s [[GiantMecha Goliath]] and an army of [[MascotMook Pipo Monkeys]]).
* ''Cratermaze'' has the Wartime levels, where the enemies become soldiers. In ''Booby Kids'' for the Famicom, the collectibles also become radios.
* ''DoubleDragonNeon'' has the Assault Zone (Mission 6), whose boss is a [[MilitaryMashupMachine Giant Tank]].
* Non-Videogame example in the ''TabletopGame/{{Pathfinder}}'' Adventure Path: "Reign of Winter Part 5: Rasputin Must Die!", in which your MedievalEuropeanFantasy-ish party travels to RedOctober-era Russia to take on soldiers, vampires, tanks, and clouds of sentient mustard gas in a prison camp before trying to give RasputinTheMadMonk himself ''another'' [[RasputinianDeath brutally overdone death]].