Roy's Conveyor Castle
Roy's Conveyor Castle, or Rock-Candy Mines-Castle is the castle of Rock-Candy Mines in New Super Mario Bros. U. It is unlocked when Shifting-Floor Cave is completed and its own completion opens the path to Meringue Clouds and Land of the Flying Blocks. Additionally, the course can be entered via a ! Switch bridge to the back door of the castle. The boss of this stage is Roy Koopa.
This castle contains iron blocks that float on lava and Dry Bones. The player first rides an iron block across some hot lava and encounter a Dry Bones and a Bony Beetle. After that, they pass by another Bony Beetle and ride on some more iron blocks in order to avoid the lava. On the way, the player may collect some coins. After that, the player reaches an area where they must hit a ? Switch, thus causing a bunch of blocks to fall on top of the surface of the lava. The player can then get on top of them and make their way to the door. The player then enters the door, launches themselves out of the cannon and proceeds to fight Roy Koopa.
The second entrance is automatically unlocked upon completion of Screwtop Tower. However, it will not be accessible under normal circumstances as all paths to the second entrance requires the use of the red Stretch Blocks to the right of Screwtop Tower, which is impossible to have been stretched when Mario is at Screwtop Tower because the south path leads to a blue switch which would have been automatically stepped on and the west path leads to blue Stretch Blocks which must have been used to cross the abyss, and there are no red switches nearby. To get to the second entrance, the player must do one of the following (in addition to completing Screwtop Tower):
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