This is the penultimate castle level in the game, and features moving platforms on pairs of tracks. The platforms can change positions on the tracks by pressing switches that control them, similar to the ON/OFF Switches from Super Mario World.
The level begins with a set of these tracks. Pressing the switch will make the platform on them switch places, a technique that will be needed in order to progress through the level. There are also Dry Bones and Lava Bubbles present within the level, meant to impede the player's progress. After a series of tracks and switches, there will be a swinging rope that the player must use in order to reach the level's midway point.
After the midway point, the tracks are replaced with rotating platforms, in either triangular or rectangular shapes. The triangular platforms will keep their shape constant after rotating, while the rectangular platforms alternate between tall and wide after rotating. After a set of these rotating platforms, the player will come across another swinging rope, which must be used to reach the boss door.
Beyond the boss door awaits Dry Bowser. He is immune to all attacks (excluding Shell Mario's dash attack, along with the Super Star and Mega Mushroom), but can still be easily defeated by pressing the switch behind him. Defeating Dry Bowser will cause a bridge to spawn outside of the castle, making the second half of World 8 accessible.