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The Decal Channel is a small area of water in Paper Mario: Sticker Star. It separates the continent containing World 1, World 2, and World 3 from World 4, World 5, and World 6. In order to enter the channel and reach the latter three worlds, Mario must gain the right to use the boat at Surfshine Harbor. This necessitates completing World 3 and defeating the Big Cheep Cheep at the harbor.
After entering World 4-1, 5-1 or 6-1 and returning to the channel, Bowser Jr. ambushes Mario and fights him for the second time. Fleeing this battle sends Mario back to Surfshine Harbor, and re-entering the channel just causes Bowser Jr. to return. This means that Mario is unable to access Worlds 4, 5, and 6 until he defeats Bowser Jr. After winning the fight, the rest of the levels are available once again.
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