Bonus arenas
Win tournament mode to unlock two bonus arenas.
Win the super heavyweight class to unlock the Machine Plant.
Win the heavyweight class to unlock the Volcano.
Hints
Easy win
When you customize your bot at the begining of each weight division, choose one or two hammers as a weapon. It does not matter what kind you use, as long as it is a hammer. Attack your enemy head on with them to gain high aggression points. Rapidly use the hammers and you may destroy the other bot. Also, by using a hammer and your bot gets flipped, you will easily be able to flip it back over on to its wheels.