Forza Motorsport ditches the open-world formula of previous entries and returns players to competitive on-track racing which features a variety of iconic tracks. While speed isn't everything when it comes to winning races, it is certainly still important, and as a result, cars have been classified into separate categories to ensure that racing is kept fair. The fastest cars are to be found at the upper end of the P and X classes, which feature race cars from both the World Endurance Championship and Formula One.