Bowser's Chambers of Doom
From the Super Mario Wiki, the Mario encyclopedia
The top right warp pipe leads Mario to an area with Skewers. The Pink Coin is near the bottom, just to the left of a ? Block. Super Mushrooms can also be collected here if the aforementioned ? Block is hit.
The top left warp pipe leads Mario to an area that cannot be accessed without a Super Mushroom. The Pink Coin is located at the top right, near an area with Koopa Paratroopas. Fire Flowers can also be collected here.
The top center warp pipe leads Mario to an area that cannot be accessed without a Fire Flower. The Pink Coin is near the Giant Bob-omb, but due to the Hidden Blocks blocking it, Mario must go the bottom and throw a Bob-omb up to the left to destroy a Hard Block and obtain a Spiny Shell, then backtrack and break the now Empty Blocks to get the Pink Coin.
The bottom left warp pipe leads Mario to an area with synchronized Fire Bars and a P Switch that Mario must press to carefully obtain the Pink Coin, just to the right. A Checkpoint Flag is also in this area, along with some Cape Feathers.
The bottom right warp pipe leads Mario to an area that cannot be properly accessed without a Cape Feather. Mario must stomp on the Koopa Paratroopas to wait for a P Switch's effects to expire, then enter a warp pipe and ride some Flimsy Lifts to a Beanstalk. Mario must then bypass some Big Thwomps and approach another warp pipe, then jump off of a Cannonball to obtain the Pink Coin. Yoshi can also be found here.
The bottom center warp pipe leads Mario to an area that cannot be accessed without Yoshi. The Pink Coin is at the top left, but Mario must first obtain a Spiny Shell, then get past the Grinders and smash a Hard Block, dropping a Bill Blaster blocking the way. POW Blocks can also be obtained here.
Mario must carry a POW Block with him back to the beginning, then take out the big Muncher to obtain the last four Pink Coins and enter the Key Door. After another Checkpoint Flag, Mario must use a Super Star to run across some spikes, then follow a red Cannonball to an area with Magikoopas and Bowser Jr., the latter of which Mario must defeat to open another Key Door. Mario must then defeat Bowser by utilizing Yoshi, then hit the axe to clear the level.
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