"forza motorsport" was released in 2005 and is the first instalment in the "forza motorsport" series, a series that has continued on microsoft's current systems, the xbox 360, the xbox one and the xbox series x. it was the only title in the series to be released on the original xbox console. it is playable on the xbox 360 via backwards compatibility on the newer platform. it features 231 cars and multiple real-world and fictional racecourses. it also featured online multiplayer via xbox live.