FlatOut is an adaptation for the Wii of the long-running racing series, combining fast-paced racing with ramming opponents and destroying objects in the environment. It contains four different game modes: Racing, Car Basher, Battle Arena and Stunt. There are twelve tracks in total, divided over four chapters. They include environments such as a busy financial district, an industrial port, and villages in Southern Europe.
Racing is the regular game mode where races have to be won by finishing in first place or wrecking all opponents. Cars have a health meter and there is a damage model with visual clues to the condition. In Car Basher the player's driver chooses one of the twelve available weapons such as a baseball bat or a crowbar, and needs to trash the opponent's car with as much damage as possible before time runs out to win the car. Battle Arena has Destruction Derby-like environments with booby traps, ramps, loopings, and fire for much more destructive gameplay. The main goal is to lure or push other cars into traps. The final game mode is called Stunt and offers classic gameplay from the series where the driver has to be ejected through the windshield at the right angle to reach targets.
The cars are controlled by holding the Wii Remote horizontally and tilting it to steer. The game can be played locally in multiplayer through a split-screen.