The fourth instalment in the DesertPunk ''[[Franchise/WildArms Wild ARMs]]'' series, released as ''Wild [=ARMs=]: The 4th Detonator'' in Japan. Notable for combining {{Platformer}} elements with a experimental strategic RPG battle and stat growth system.

Jude Maverick is a typical teenage boy whose peaceful life is forever changed when a fleet of airships literally ''break through'' the sky above his sleepy hometown. With this comes the discovery that his village is actually a massive airborne shelter, one designed to protect its inhabitants from a ravaged wasteland and the military forces seeking a forbidden weapon known as "ARM". In the ensuing battle against the invading army, [[ClingyMacGuffin Jude accidentally "bonds" with the ARM and becomes the host of its incredible power]].

Escaping [[DoomedHometown the destruction of the shelter]], Jude is forced into the ruined world of Filgaia: a planet that has been pushed to the brink of complete collapse by decades of continual warfare. Pursued by an [[QuirkyMinibossSquad elite unit known as "Brionac"]], Jude must discover the secrets behind the "ARM" and what the military plan to do with it, all while struggling to find a place in this harsh new world.

On his journey he is joined by three others: Yulie Ahtreide, whose experimentation at the hands of the army has left her with the ability to control [=ARMs=]; Arnaud G. Vasquez, an intelligent but cocky mercenary who takes Jude under his wing; and Raquel Applegate, [[TheBigGuy a swordswoman]] and artist WalkingTheEarth in search of its last remnants of beauty.

The gameplay of ''Wild Arms 4'' mixes together RPG and platforming sections, and an experimental new battle system based upon hex grids. While interesting, the system had a few balance issues that were straightened out properly in ''VideoGame/{{Wild Arms 5}}''.

!!This game provides examples of:

* AdultsAreUseless: Though present in the game, there are many instances that subvert this trope.
** Nearly every boss in the game is an adult that your party barely beats 4-on-1. Later they all have GameBreaker abilities that you have to find the AchillesHeel of in order to even damage. If anything the message is that kids are useless (but plucky).
** Lambda specifically states that the problem is that his team forgot the value of teamwork, which is the entire reason they lose.
*** If anything, this game seemed to be trying to create an ''Adults Are Evil'' variant in its place.
* TheAlcatraz: Ilsveil Prison, which appears in most of the games. Also doubles as the TheVeryDefinitelyFinalDungeon.
* AntiVillain: Kresnik and [[spoiler:Gawn]]. Depending on your point of view, this could be stretched to all of Brionac as well, apart from [[AxCrazy Jeremy.]]
* AxCrazy:
** Belial is nuttier than a fruitcake.
** Jeremy shows traits of this as well early on, but once [[spoiler:he becomes a HalfHumanHybrid with his ARM]], he's even ''more'' crazy then Belial was.
* BadassNormal: [[spoiler:Gawn]] and Augst are the only members of Brionac without a supernatural power or special ability, and the former is nevertheless their best fighter while the latter is their strategist.
** In the main group, Arnaud seems to fill this role. He has no connection to arms and no combat experience. Just his brains and knowledge of spells.
* TheBigGuy: Raquel as a class 2.
* BittersweetEnding: [[spoiler: Raquel eventually succumbs to her condition and dies after giving birth to Arnaud's daughter, having finally found true beauty.]]
** Also, despite having promised to help build up Halim, [[spoiler: Jude ends up living alone out in the wilderness.]]
* BlockPuzzle: It ''is'' a Wild [=ARMs=] game, after all.
* BreakTheCutie: And the Ugly, and the Not Bad Looking But Needs To Work Out...
** Sticking with this game's putting minor variations on old tropes, you could say this one is ''Break 'em All''.
* BulletTime: The gameplay convention for Jude's Accelerator ability.
* CameraScrew
* ChekhovsGun: If you take the time to fully investigate the White Orphanage and Aerial Fortress Eulalia, you can find a veritable armory of these lying around.
* CombinationAttack: One for each pair, set of three, and a hidden one for the whole party.
* CrowningMusicofAwesome: [[http://www.youtube.com/watch?v=B43AuRlR1e0&fmt=18 Buried City]]
* DeathIsASlapOnTheWrist: If you die in battle you can just retry the battle as many times as you please, unlike previous games where you had to use valuable coins to do so.
* DefeatMeansFriendship: Some of the officers in Brionac.
* DisappearedDad: Jude's father.
* DoomedHometown: Ciel.
* DuelBoss: Jude vs. Kresnik.
* EvilutionaryBiologist: The scientists who ran the White Orphanage. They took orphaned children and used a variety of cruel methods to attempt to mass-produce artificially evolved humans who were Gene Drivers. Of all their subjects, only 19 survived the initial experiments, and only Yulie and Kresnik were not eventually killed or turned into mutated horrors.
* FloatingContinent: Ciel, although it's only a town (and the surrounding forest) rather than a whole continent.
* ForgottenSuperWeapon: The Divine Weapon.
* HeelFaceTurn: [[spoiler:Gawn and Kresnik. The latter may still be alive at the end, but as for the former...see below.]]
* HeroStoleMyBike: Jude borrows one to chase a train down.
* HumanAliens: It's a Wild Arms game, so this is standard.
* HumansAreBastards: [[spoiler:Hauser]] is eventually driven insane by this belief.
** Couple this with GenerationXerox, and [[spoiler:that interpretation of the epilogue in which Jude is assumed to have become a hermit doesn't look so improbable after all.]]
* IllGirl: Raquel. [[spoiler: Implied to be dying of radiation poisoning]]
* ItemCrafting: Rare weapons and accessories can be obtained this way.
* LeyLine: The ley points.
* MetalSlime: The Grow Apples (Exp) and Melchoms (money).
* MorphWeapon: Jude's "Shapeshifter" ARM.
* PeopleJars: In the White Orphanage.
* PrequelInTheLostAge: It seems to be set during a period of time constantly alluded to in other games in the series of a massive world war where cyborgs and nanomachine monsters freely roamed the lands. Many of the world's bigger cities have been destroyed in the chaos and are slowly turning into the types of locations you see in games such as ''VideoGame/{{Wild Arms 3}}''.
* RacingTheTrain: Jude does this [[HeroStoleMyBike while riding a bicycle]]. The bike eventually breaks from the strain.
* RecurringBoss: Surprisingly averted, considering the series. Only two members of the QuirkyMinibossSquad are fought more then once.
* SeaMonster: The Sapphire Drake.
* SlidingScaleLongName: The only happy people are the ones who died horrible deaths.
* [[SorryImLate Sorry I'm Late]]: There are a series of battles in which the four protagonists are supposed to fight alone. However, Yulie ends up against impossible odds since it was a ploy to split them up and capture her. About two rounds into the fight, assuming you survive that long, the rest of the party will show up to rescue her.
* TheSmartGuy: Arnaud.
* SortingAlgorithmOfEvil: Played straight until you face Belial, then subverted in that each member of the QuirkyMinibossSquad after that seems to be ''weaker'' than the last.
* TalkingIsAFreeAction: Taken to an physics-defying awesome degree in Gawn's final inspiring speech.
* TitleDrop: While each game in the series works the term "ARM" in somehow, this marks the first time the term "Wild [=ARMs=]" is used - [[spoiler:to refer to the monsters growing out of control in the final dungeon]].
* TraumaCongaLine: The second half of the game seems bent on making Jude suffer as much as possible.
* VisualInitiativeQueue
* TheWallAroundTheWorld: The barrier surrounding Ciel.
* WhatHappenedToTheMouse: Several members of Brionac whom the party defeats but doesn't kill.
* [[WhatTheHellHero What The Hell, Villain?]]: [[spoiler:Gawn is ''pissed'' when he finds out Lambda murdered the Cabal.]]
* WhereAreTheyNowEpilogue