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The Gate Cliff, or World 6-1, is an area in Paper Mario: Sticker Star.
Mario accesses the cliff by his boat. If he does not have the 5 Royal Stickers from the first five worlds, then Kersti remarks that the cliff blocks their path, and it will never go away. At this point, Mario has no choice but to leave.
However, when Mario returns with the 5 Royal Stickers, they begin glowing, and 5 points appear on the cliff. After placing the stickers by Paperizing, the cliff peels off and turns around to reveal Bowser's face. Mario pastes the face back on, and the face is revealed to be part of Bowser's Sky Castle, which flies out of sight. Mario cannot follow, and thus needs to find a way to reach the castle. Preferably, someone whom he had already helped back in World 3.
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