From the Super Mario Wiki
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The player starts out in a room with nothing but a ? Block containing a Super Mushroom and a Warp Pipe. After taking the Warp Pipe, the player ends up in a room where the only thing they can do is take a Warp Door. Going through the Warp door takes the player to an area of Rotating Blocks and Donut Blocks that makes a circle, a Pipe that gives Cape Feathers though blocked by Rotating Blocks, and another Warp Door below the first. This Warp Door takes the player to a vertical section where the only way up or down are Donut Blocks and a Dry Bones below. The player can't go to the other part of the vertical section because of a One-Way Wall below and a Bill Blaster. However, the player can use the Cape to lower the Bill Blaster and reveal that it shoots Super Stars. After going down, the player needs to get past a Thwomp above Rotating Blocks and the third Warp Door, though one gives Cape Feathers. After taking the Warp Door, the path is blocked by a Thwomp with a Key. To make any progress, the player needs the Cape to either hit a Rotating Block to have it produce a Vine or use it on Rotating Blocks and content with a Dry Bones. But, if the player needs to get the Cape, there is a One-Way Wall that gives access to the first Warp Door. At the top, the player needs to use the Key to unlock the Key Door. After taking this Key Door, the player then needs to jump on a Buzzy Beetle and send him to remove Rotating Blocks blocking a Pipe that gives Super Stars or just take damage to get past the last Thwomp guarding the Warp Pipe.
Back in the main area, there is a row of Rotating Blocks and ? Blocks and a Hidden Block which contains a 1-Up Mushroom. After this, the player needs to go through four rooms of three enemies, one of which is big and needs to be defeated for their Keys. In the Rocky Wrench room, there is a Pipe that gives Cape Feather, though blocked by Rotating Blocks. In the Jumping Piranha Plant room, the entrance is on a Rotating Block containing a Fire Flower. In the Dry Bones room, the entrance is on a Rotating Block containing a Cape Feather. In the Monty Mole room, the entrance is on a Rotating Block containing a 1-Up Mushroom. After these rooms, the player needs to get past the Lava Bubbles to get to the Giant Gate.