The sequel to the 2004 original, FlatOut 2 expanded on the destruction physics and ragdoll mechanics that defined its predecessor while moving toward a street racing aesthetic. Where the first game leaned on off-road and demolition derby settings, FlatOut 2 drew from the mid-2000s import tuner scene, introducing three car classes — derby, race, and street — and widening the vehicle roster to reflect that broadened scope. Tire grip was also adjusted: players gained more precise control in corners, reducing unintentional skidding compared to the original.
Races in FlatOut 2 take place on varied circuits with destructible environments and persistent car damage. Up to eight cars compete simultaneously, with collision and deformation physics driving the experience. The game rewards aggressive driving: ramming opponents, destroying track-side objects, and maintaining momentum through chaotic multi-car incidents are all central to competitive play.
The ragdoll driver ejection system received significant development compared to the first game. During races, a sufficiently violent impact can throw the driver through the windshield and clear of the vehicle. FlatOut 2 built an entire side mode around this mechanic: stunt minigames in which players deliberately launch their driver from the car to complete objectives. These include knocking down a set of bowling pins, hitting designated zones on a dartboard, scoring a field goal, and flying through flaming hoops. Players control the driver in flight through aerobatics — tilting and rotating the body — but overuse of aerobatics increases drag and reduces distance. A "nudge" feature gives the driver a small upward boost during descent, which also slightly reduces drag and allows players to correct short launches.
The Stone Skipping stunt minigame tasks players with timing nudges precisely as the driver contacts a water surface, maximising the number of bounces and extending total distance. These minigames became the most-discussed and widely remembered element of FlatOut 2, giving the game a comedic, physics-sandbox dimension absent from most contemporaneous racing titles.
The PC version of FlatOut 2 received generally favorable reviews according to Metacritic. The PlayStation 2 and Xbox versions scored in the average range. In Japan, Famitsu awarded the PlayStation 2 version a score of 28 out of 40, with all four reviewers giving it a seven.
An enhanced port for Xbox 360 and Windows, released as FlatOut: Ultimate Carnage, arrived in Europe on 22 July 2007, in Australia on 1 August, and in North America on 2 October. The Windows version launched through Steam on 26 August 2008, with a retail release following on 2 September.
Ultimate Carnage introduced a dedicated Carnage mode comprising 36 challenges across stunts, demolition derby deathmatches, carnage races, and bomb-avoidance events. The visual presentation was substantially upgraded: cars were rebuilt with up to forty individually destructible parts, using advanced dynamic lighting and shadow rendering. AI car counts rose, with single player events supporting up to eleven computer-controlled opponents per race.
Multiplayer in Ultimate Carnage ran through Games for Windows Live, requiring players to sign in with an Xbox Live or Games for Windows Live account. Unlike the earlier PC versions of FlatOut and FlatOut 2, Ultimate Carnage did not include a LAN mode.
A PlayStation Portable version called FlatOut: Head On was released in Australia on 12 March 2008, in Europe two days later, and in North America on 4 April. The Xbox 360 and PC versions of Ultimate Carnage received favorable reviews; the Head On port received average reviews. Famitsu scored the Xbox 360 version 27 out of 40.
An OS X version of FlatOut 2 was released by Virtual Programming in 2008. A 2024 PC update added Steam Workshop support, improved compatibility with the Steam Deck, and miscellaneous quality-of-life improvements.
FlatOut 2 and its Ultimate Carnage version are widely considered the peak of the FlatOut franchise. After publisher Empire Interactive went bankrupt, the series passed to Dutch developer Team6 Game Studios, whose subsequent entries received strongly negative reviews. Bugbear Entertainment, the original developer, later released Wreckfest in 2017, which is broadly regarded as a spiritual successor to the FlatOut formula — physics-first destruction racing with persistent vehicle damage and a focus on spectacular collisions. FlatOut 2 remains the standard against which destruction racing games are measured by fans of the genre.