[[ShootEmUps Shoot Em Up]] series by Creator/BizarreCreations, similar to ''VideoGame/{{Robotron 2084}}'', where you control a claw-shaped concave octagon in a quest to destroy many other shapes. Primarily notable for reinvigorating the stale genre and for having insane amounts of stuff on the screen at once (due to the minimal computational power required for each object). Originally an EasterEgg in the ''VideoGame/ProjectGothamRacing'' series for the Xbox. The series' second incarnation, ''Geometry Wars: Retro Evolved'', and its sequel have been released as stand-alone games for the Xbox360 Arcade. It also has a DS and Wii version, ''Geometry Wars: Galaxies'', as well as a PC clone (with more features) called ''GridWars'', whose development was reportedly stopped at the request of the parent company. It seems this was sorted out, as ''Grid Wars 2'' can be downloaded for free. ''GW: Retro Evolved'' is also available for the PC via UsefulNotes/{{Steam}}.

At Gamescom 2014, Creator/{{Activision}} announced that ''Geometry Wars 3: Dimensions'' was in the works, being developed by Lucid Games, a company made up of former Bizarre Creations staff, including the actual people behind ''Geometry Wars''. It'll be released under Activision's revived Creator/{{Sierra}} label.
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This series provides examples of:

* AsteroidsMonster: Purple squares. Also, Galaxies has an entire level based on the ''Asteroids'' game, only the {{captain ersatz}} asteroids may turn hostile depending on their shape, especially if it is of the Pink/purple squares.
* AttackAttackAttack: Many shapes, the green ones notably will only charge when not shooting an make great effort to avoid your shots, slowing to a possible stop should you even aim in their direction. In waves they most opt to sweep every single part of the screen rather than attack directly.
* AttackDrone: Several in Galaxies, but they have to be bought.
* {{Cap}} (the highest composite score obtainable on ''Galaxies'' is [(2^30)-1]x25)
** The DS version also has some unfortunate (or maybe ''fortunate'') limits to onscreen objects.
* BoringButPractical:
** The Sweep drone in ''Galaxies''. It doesn't fire, instead sweeping around your ship and damaging any enemies that happen to touch it. At higher levels, it makes faster and more precise circles around your ship, serving as a very useful defensive barrier.
** Attack and Defend fire forwards and backwards respectively. They don't do much else, but more importantly, higher levels of these drones can help augment your firepower very effectively. A max-level Attack drone effectively doubles your firepower, while a max-level Defend drone keeps you covered in large, crowded spaces.
* ChainReactionDestruction: Bars and certain circles in two.
* CollisionDamage: Pretty much all other shapes other than the harmless yellow UFO targets; walls are usually safe however. There is a group of red enemies that will shoot you if given the chance. Luckily their range is shorter than yours. Also, your shots will bounce off the bars so you have to run into them.
* EmbeddedPrecursor: ''Galaxies'' contains a full copy of ''Retro Evolved''.
* EndlessGame: Except for sequence and deadline.
* [[EveryTenThousandPoints Every Five Thousand Geoms]]
* EverythingTryingToKillYou: Except for the yellow ovals, who simply avoid you once fired on.
* ExactlyWhatItSaysOnTheTin
* GameLevel
* LevelGrinding: In ''Galaxies'', you have to level up your drones by playing stages.
* MercyInvincibility: A protective bubble that blinks out a moment later.
* MightyGlacier: Slow moving white shapes surrounded by multiple blue bubbles.
* MoneyForNothing: You'll unlock everything in ''Galaxies'' long before you receive all the bonus geoms for hitting score plateaus,
* MoneySpider: In ''Galaxies'', you'll occasionally stumble upon a red UFO that swoops in, then vanishes very shortly afterwards. Hitting it will yield a large sum of points.
* MookMaker: They can already spawn at incredible rates, but these guys make them come in even quicker.
* MyRulesAreNotYourRules: In "King" you have bubbles the enemies cannot pass through, but you and your shots can (though they don't last for long). ''Galaxies'' turns this around on you for a few levels.
* NoPlotNoProblem: You are a claw-shaped object inserted into the game grid. Other simple geometric shapes are generated, and they try to destroy you. What would you need more for?
* OneGameForThePriceOfTwo (the DS and Wii versions of ''Galaxies'' unlock content on each other - the same content on both - but are otherwise identical)
** Also inverted in that Geometry Wars started out as a game inside Project Gotham Racing, and has since had some form in its games. Geometry Wars Retro in PGR2, Evolved in PGR3, and waves in PGR4. Two Games for the price of one
* OneHitPointWonder
** Even more so in ''Galaxies''[='=]s "Sur-" (Survival) stages, where you get one life, no bombs, and no way to get more of either.
* OneUp
* PacifistRun: The "Pacifism" mode in ''Geometry Wars 2'' is of the TechnicalPacifist variety one would suppose as you cannot shoot but you can still destroy shapes.
* PinballScoring: The "Min-" levels in ''Galaxies''. Using the mines in conjunction with a maxed-out (x150) score multiplier, a MookMaker, and the harmless bonus-point golden [=UFOs=] will allow you to rack up hundreds of millions in points within seconds. Heck, on the earlier "Min-" stages, you can go from below Bronze to exceeding the requirement for a Gold medal ''in the span of less than three seconds.''
* RammingAlwaysWorks: The Ram drone in ''Galaxies'', which rams into enemies, but needs a little cooldown between uses.
* RepurposedPopSong (''Galaxies'' uses [[TheyMightBeGiants "Particle Man"]] [[http://www.youtube.com/watch?v=3GpsG8iQ5oY here]].)
* RespawningEnemies
* ScoringPoints (The point of ''Retro Evolved'' and ''Retro Evolved 2'', and what you need to do to advance in ''Galaxies''.)
* SegmentedSerpent: The worm enemies, which can only be attacked in the head.
* SelfImposedChallenge: Due to how Min- stages have disproportionately higher scores than other stages, some players will make files where they don't play Min- stages at all so that their total scores don't end up skewing towards these sorts of stages.
* ShieldBearingMook: Orange things that can only be hit on the parts where they are not orange.
* ShootEmUps
* ShoutOut: The [[Film/TheKarateKid "Wax On" and "Wax Off"]] Achievements.
* SmartBomb: Unlike many other games with a bomb system, your bombs don't reset count each time you die. Instead, the only way to gain bombs back is through points or geoms, and that's if the game allows extra bombs.
* SpreadShot: Like many other games it the genre it gets wider as you do better in Retro Evolved and Galaxies. Unlike others it periodically switches between wider spreads and MoreDakka.
* TeleFrag: You usually get a split second to move away should an enemy spawn in your exact location, usually.
* TheTetrisEffect: Given the simple designs of the enemies, it's not too far-fetched to suddenly imagine shapes around you to start moving in ''Geometry Wars'' patterns.
* ThemeNaming (levels in ''Galaxies'' follow a strict format - three letters for the type, then something denoting a cardinality; e.g. ''[=MinDuo=]'' is '''Min'''e level 2.)
* ThirdIs3D: Well, its not exactly the third game in the series, but ''Geometry Wars 3'' changes the formula up by adding SuperMarioGalaxy style levels where the playfield warps around several 3d objects while maintaining the top down 2D movement and shooting.
* TimedMission: Deadline obviously while sequence throws a sequence of these at you.
* WeaponsThatSuck: Gravity wells are common enemy type in ''Galaxies''. Fortunately, they affect all shapes, even each other and they do not start until you shoot them. Described in more detail on UnrealisticBlackhole.

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