Most of the game's Beetle Battle stages are hidden and have to be unlocked before you can square off against your friends.

In order to get them, you need to enter the Championship mode and try to smash all the bonus boxes on the respective tracks. You have to collect all 100 points to unlock a new battle stage. All the battle stages are directly based on their track counterparts. Note that it is not necessary that you come in first in the races, but your points are not counted if you are disqualified.

Tip: Use the Police Beetle to get the tracks. It's fast -- and you can force cars to pull over and take your time to collect the boxes.