Get 2 new arenas:
To get 2 new arenas beat Tournament mode once.

Level Unlocks:

Volcano Level:
Beat Heavyweight mode
Machine Plant Level:
Beat Super Heavyweight mode.
Easy win:
Select one or two hammers as a weapon when you customize your bot at the begining of each weight division. Gain aggression points by attacking your enemy head on with them rapidly using the hammers until your enemy is destroyed. If you get flipped you will easily be able to flip back over onto your wheels using the hammer.