Larry's Scary Lair
From the Super Mario Wiki, the Mario encyclopedia
This level features a boss battle with Larry. Larry's sole tactic is walking around, swinging his scepter to make a Cannonball travel towards Mario, always adjusting to ensure he is on the same floor as Mario. Mario must jump on Larry to briefly stun him; he can jump on Larry again to stun him for a longer period of time. The level consists of five floors, with anywhere between two to five doors on each floor.