Roy's Ironclad Castle
From the Super Mario Wiki
The castle begins on blocks made of metal, with a ? Switch found nearby. Pressing the switch causes the iron blocks to begin moving. A Dry Bones is found, along with with a ? Block and a Conveyor Belt. A Conveyor Belt with iron blocks dropping from the ceiling is found, followed by a Dry Bones on a Conveyor Belt. More metal blocks are dropped onto Conveyor Belts, followed by a platform. A ? Block is found, along with another ? Switch that causes more iron crates to begin moving. Two iron blocks with Bony Beetles are found moving along a Conveyor Belt. Another ? Switch is found, along with stacks of iron blocks in the lava. After the switch is pressed, the blocks begin moving and lowering into the lava. Bony Beetles and a P Switch are on the blocks. A Bony Beetle is found at the end of the area, followed by a platform leading to the boss door. Like in New Super Mario Bros. U, Roy Koopa is the boss.
It is notable that this castle has a shortcut, which can be accessed by taking the alternate route from Sumo Bro's Spinning Tower. The third Star Coin, which is otherwise unaccessible, can also be obtained, along with a ? Block.
An 8-bit Luigi can be seen near the lava next to the second Star Coin.
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