Master Arena is the 14th and an unlockable arena in Rodent Rumble mode. It contains four blast holes and more like sides of a square added in the middle. There are no barriers in the arena, but something exploitable was added in sides of the arena. There is a round path which used by some players to make their opponents fall off. Some textures and things haven't been changed. This is also the case in the race as well.
Also, no enemies and obstacles being added unlike the race.