@Gamergull Select a vehicle and start. All other vehicles (AI-controlled) are going to smash you. If you smash them and drive away, they will respawn after out of sight. Game Over occurs if your vehicle can no longer move. Scoring is survival time+travel distance+vehicle you smashed.
A little bit more than the derby, in this mode you can still earn a lot of points if you don't smash at all, by survive for a long time