Behind Chain-Chomp's Gate
From the Super Mario Wiki
Behind Chain Chomp's Gate (also known as Behind Big Chomp's Gate) is the sixth mission of Bob-omb Battlefield in Super Mario 64. In Super Mario 64 DS, the mission is named Behind Chain-Chomp's Gate and was moved to the seventh and final mission of the course. The mission's objective is to obtain the Power Star guarded by the titular Chain-Chomp.
In Super Mario 64, the Power Star is behind some iron bars, which can only be removed by ground-pounding the peg that the Chain-Chomp's chain is attached to three times. This frees the Chain-Chomp, letting it break the bars and escape. The Star in Super Mario 64 DS is located in the same place and can be collected in the same way, but there are several alternatives to getting this Star. This includes using Vanish Luigi to phase through the bars, ground-pounding the peg a single time as Wario, or collecting the Star during 5 Silver Stars! using Vanish Luigi when the Chain-Chomp relocates to the adjacent field.
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