Based on Unity car-racing project assets and features:
- car model
- one level designed entirely by the Unity team
- original racing mechanics/physics, etc.
- original Unity project and assets
- two players
- splitscreen mode
- minimaps (the credit goes to Rman)
- conversion to Unity3D 3.0
- new car textures
- three new terrain textures
- new background music (Garrett Lindquist's Two Assassins Meet)
- new icons, the original project had none
For the detailed list of assets added, check the list of new assets.