Fiery Stage

The Fiery Stage, also known as Bowser's castle or the castle, is the final stage in Mario Pinball Land. It can be accessed only while Mario is in possession of a Star Key, which can be used to unlock one of the four boss statues, or after all Star Keys are collected, which unlocks the rest of the stage. Flying Shy Guys and Armored Koopas are found defending the castle, as well as each of the previous bosses fought. Bowser is the boss of the stage and the final boss of the game.

Areas
NOTE: Unless otherwise marked, all names are unofficial.

Starting area
The starting area features four boss statues depicting Petey Piranha, the Egyptian Koopa, Porcupuffer, and Big Boo. After each Star Key is brought to its statue, the door to the next areas is opened. Afterwards, three Flying Shy Guys can be found in the area, and defeating all of them yields the player a Star.

Main room
The main area of the Fiery Stage is accessible via the gate in the starting area. The room features a Sky Cannon and Toad's tent, as well as five Flying Shy Guys. Defeating all of them yields the player a Star.

Boss room
The boss room is accessible via the 15-★ door in the main area. In it, Bowser is fought, alongside two Thwomps, each chained to a cog. 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, possibly causing Mario to be sent out. Every time Mario hits Bowser while he walks causes him to rebound to another part of the room. Hitting Bowser while he stands stops him from doing his jump. By hitting each cog multiple times, Mario is able to lift the Thwomps. Activating the Blue Switch at the center of the room causes the Thwomps to hit the ground, stunning Bowser and allowing Mario to hit him. After Bowser is hit like so three times, he rolls into a ball, and the player must use the flippers to knock him around the room while making sure Mario also stays in the room. The player must hit Bowser toward the wall on either side enough times to launch him out of his castle. Afterwards, Mario saves Princess Peach, and they go back to the Fun Fair to ride the roller coaster.

Armored Koopa room
The Armored Koopa room is accessible via the 21-★ door in the main room. It features a hole located at the center of the room, as well as three Armored Koopas that can be defeated by being knocked into a wall. Defeating all enemies yields the player a Star.

Pokey room
The Pokey room is accessible via the 23-★ door in the Armored Koopa room. It features two enchanted obelisks and four Pokeys. Defeating all four Pokeys triggers a rematch with the Egyptian Koopa. Defeating the boss again yields the player a Star.

Cheep Cheep room
The Cheep Cheep room is accessible via the hole in the Armored Koopa room. It features six Cheep Cheeps swimming in a circle, as well as two cannonball bomb hatches. Defeating all Cheep Cheeps triggers a rematch with Porcupuffer. Defeating the boss again yields the player a Star.