Forza Motorsport 3 is an auto simulator game developed by Turn 10 Studios. It is the third game in the Forza Motorsport franchize.
The main game mode is Season Play. The players are given three events to choose from, which consist of three to five races at the beginning of the game. On the last day of the second week, a championship takes place. Each season has more and more season races.
Forza Motorsport 3 has a car class system that depends on the Performance Index. 11 performance classes are present in the game. Performance Index is calculated by evaluating the car's base stats, such as Speed, Handling, Acceleration, Launch, and braking. The Performance Index can be increased by buying car upgrades or decreased if the car's weight gets bigger or the players decide to switch the drivetrain.
The players can create completely custom designs of their vehicles and later upload them to the internet. It is even possible to record videos through the in-game photo mode and upload them to the Forza Motorsport 3 website.
The game features a competitive multiplayer mode, which pits eight players against each other on any track available in the game. The multiplayer lobbies are fully customizable, which allows for creating both realistic races like an actual 24 hour Le Mans marathon on Circuit de la Sarthe or teaming up together for a fun drift session.