''Cube'' is an open source FirstPersonShooter game engine developed entirely by Wouter van Oortmerssen. The first fully-featured version, with both multiplayer and "kill them all" singleplayer, was released in 2002.

Despite being based on both ''VideoGame/{{Quake}}'' and ''VideoGame/{{Doom}}'' in terms of gameplay, the engine was fundamentally different. It divided each map into a grid of cubes, which could be solid (a wall) or open (with a "floor height" and a "ceiling height"). This meant that map design was fairly limited, but because of the engine's limitations, map building - which, for most engines, can take up to ten minutes running numerous external utilities - could be done in realtime, allowing anyone the ability to design maps in-game. This was seen as the engine's big selling point, along with the fact that, being open source, it could be easily modded.

Wouter, still not satisfied, eventually released a new engine, ''Cube 2'', in 2004. The game that came with it, ''Sauerbraten'', is based on the same gameplay as its predecessor, with all the same weapons, game modes, and so on. However, the new engine added support for a nauseating amount of new features, including a ton of graphical effects, but most notably, it replaced the old map system with a vastly improved engine based on cuboid octrees instead of heightmaps. In [[LaymansTerms layman's terms]], that means that maps can still be edited in-game, but nearly all of the restrictions present in the old engine are gone.

The "Trooper Edition," update to ''Sauerbraten'' turned all of the dials UpToEleven and added an obscene amount of new content, including NewAndImproved models for all of the weapons and [[ChainsawGood a chainsaw]].

Both games can be found [[http://cubeengine.com/ here]].

[[NamesTheSame Completely unrelated]] to [[Film/{{Cube}} the movie of the same name.]]

!!The games provide examples of:

* BottomlessMagazines: You may run out of ammo, but you never have to reload.
* ChainsawGood: As mentioned, the new melee weapon in the Trooper Edition. (The old one was a basic punch.)
* CherryTapping: The instagib modes encourage this, giving you a rifle with infinite ammo... and your melee weapon, which ''also'' kills in one hit. (This is a subversion, though, since the rifle has a long cooldown time, making the melee weapon a practical choice in certain situations.)
* ColorCodedForYourConvenience: The enemy team is always red, your team is always blue.
* DeathIsASlapOnTheWrist: It's not necessarily even that, as there's no timer for respawning in the instagib modes. On a busy server you could get killed three times within a second - no big deal.
* EmergencyWeapon: The melee weapon (fist in ''Cube'', chainsaw in ''Sauerbraten'') acts as one most of the time. In ''Sauerbraten'', your pistol acts as one as well, since you get ammo for it practically everywhere.
* GameMod: A few. The most popular by far is [[http://assault.cubers.net/ AssaultCube]].
* GenreThrowback: The author specifically said he wanted to bring back ''VideoGame/{{Quake}}''-style deathmatches.
* GratuitousForeignLanguage: several example, which can be [[BilingualBonus Bilingual Bonuses]]
* GratuitousFrench: Cube, Assault Cube and Sauerbraten have by their official maps a map called ''douze''[[labelnote:note]]actually the Assault Cube version is called ''ac_douze''[[/labelnote]]. Douze means twelve in French and this map have twelve opened doors.
* GratuitousGerman: The game is named after a kind of German pickled roast beef. This is because the original programmer Wouter van Oortmerssen is quite fond of naming stuff after food. He also goes by the nickname aardappel (which means potato in Dutch)
* KnightTemplar: Captain Cannon
* LevelEditor: It's the most famous feature of both games. Basic premise: the map is divided by a grid; you can select any area of it (save for walls in ''Cube'') and edit its height and add various stuff like ammo, enemies, map models, triggers, lights... and it's ''even'' easier than it actually sounds.
* {{Telefrag}}
* OneHitKill: Indirectly; see below.
* OneHitPointWonder: Any of the instagib modes. Everyone has only one hit point, and everyone gets a rifle with infinite ammo.
* OurOgresAreHungrier: The Ogros, which are smaller than ogres but just as fat and stupid. And ''not'' AlwaysChaoticEvil.
* PlayableMenu: Or, go away until the pause menu disappears out of your sight. Yes, this is the only known first-person shooter so far to have a [[TimeKeepsOnTicking real-time]] floating-on-the-level options/level select menu. (It's not on by default. Still TimeKeepsOnTicking though.)
* RandomlyGeneratedLevels: ''SLUDGE'' in one of the mods for ''Cube'' is a basic attempt at this.
* RefugeInAudacity: ''Four-barreled shotgun'', anyone?
* RocketJump: In addition to traditional rocket jumping, you can also get a good boost by firing the rifle straight down.
** There originally was a whole testing polygon for this.
* SlidingScaleOfSillinessVersusSeriousness: Guns are pretty no-nonsense, though not realistic. Characters are goofy. Environments range from gritty scifi to a cartoonish pirate ship to whatever you can think up. Ultimately it leans on the silly side.
* TopHeavyGuy: Playable character Captain Cannon's physique.
* WordSaladTitle: ''Sauerbraten''.