TrackMania United Forever follows TrackMania United in the main TrackMania series. The game is in essence an expansion for TrackMania United which owners of that game can download for free through the game's auto-updater. The retail version includes the entire content of both TrackMania United and TrackMania United Forever.
New in Forever is an update in the engine that allows players of this game and the freeware spin-off TrackMania Nations Forever to play against each other in Stadium - one of the seven racing modes. The game also comes with various new tracks and a graphical overhaul of the oldest three racing modes (Desert, Rally and Snow). There is also a new solo campaign and various new building blocks for use in the editor. Additionally the game also no longer features cd copy protection that requires the players to keep the DVD in their drive and anti-cheat systems have been improved.