Dirty Valey is binweevils racing arena that consist of 3 Tracks. Click your Map -> Select Go Racing
Here you must choose one of the cars quickly before taken by other weevils (For the mass race or multiplayer).
In Time Trials mode (single player), the reward from these binweevils racing game is Track 1 Trophy for your Nest. You must have good race time to win a Bronze (0:45), Silver (0:37) or Gold trophy (0:30).