Choosing your battle scenery
Before you start a Bowser battle, switch as Mario and Luigi and go to either the Airway, Pump works, Nerve Cluster, Trash Pit, Energy Hold, or Flab Zone. (other body parts will have no scenery) Then switch back to Bowser and start a battle that involves Mario and Luigi fighting too. I.e. Choomba and Coalbit, Naplock and Alarm Bob-omb (Bowser bosses count too, except the final boss) inhale the small monsters or monsters floating on the top screen when you can. When the camera zooms in on Bowser's body it will show the inside of the body part you selected as Mario and Luigi and you fight the inhaled monsters there.
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