After putting the [[Star Key (Mario Pinball Land)|Star Key]]s into all four [[boss statue]]s to open the gate, [[Mario]] goes into the main foyer (where another [[Sky Cannon]] and [[Toad's tent]] were located). The player has the option to explore the other rooms in the castle, where Mario will end up fighting all the bosses again (after clearing the room of the other enemies,includingsuch as [[Fly Guy|Flying Shy Guys]], [[Armored Koopa]]s), and a [[Monty Mole|1-up Mole]]), or go through the [[Big Star Door|wooden door]] in the middle of the foyer and face [[Bowser]]. Bowser's arena is quite small, as all the other [[level]]s are, but the Koopa King himself proves to be quite tricky. Bowser wanders around the room until he finds a spot to jump on. His landing causes the flippers to get stuck for a few seconds, rendering Mario vulnerable to be sent out. Every time Mario hits Bowser while walking causes him to rebound to another part of the room. Hitting Bowser while standing stops him from doing his jump. The only way to injure Bowser, however, is to spin the gears on the wall to raise the chained [[Thwomp]]s upward, and then hit the [[! Switch]] in the back of the room. This makes the Thwomps fall on the ground, causing Bowser to fall backwards, leaving Mario to bash him. Mario does this three times, but instead of beating him, Bowser curls up, acting like a giant pinball. It is then the flippers' job to keep Mario from falling out while bashing Bowser into the wall enough to send him flying out of the castle. This leaves Mario saving [[Princess Peach]], and they both go back to [[the Fun Fair]] to enjoy the rest of the day.
