World 7-6 (New Super Mario Bros. Wii)
From the Super Mario Wiki
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World 7-6 is the sixth level of the World 7 in New Super Mario Bros. Wii. This level can only be accessed after the player finds the secret exit in World 7-. In this level, there are Para-Beetles and Heavy Para-Beetles. Because there is not any ground for the players to stand on, they will have to ride on the Para-Beetles for the entire level. There is also one lone Yoshi at the beginning of the level. Clearing the level creates a path leading directly to the World 7 Castle, as well as a second path that leads into the castle, in a room near the boss door.