The Sky Castle is the fifth dungeon in Monster World IV. In the original game, it can only be reached by the Magic Carpet which is obtained on the clouds. The area itself is a bright and vibrant location scattered with springs, moving conveyor belts and spike logs that will remove a heart and reset the stage when contacted. Deeper within the area, the player must utilize a gate that alters the player's size. This gimmick is later used to defeat a mid-boss.