Basically, You have 2 teams.
Red and Blue
Each team has one, 'mouse', which is usually a Class E, or slow car. The rest of the team need to be quick cars ideally.
The aim of the game is to get your mouse to the finish line before the other team's mouse gets there. To do this, you need to either try running the other teams mouse off the road
OR
Protect your mouse by trying to block the other team from ramming it off the road.