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The giant 6 made out of blocks in Bowser's Castle in Super Mario World can kill Mario in two ways. Jumping on top of it can cause him to be pinched between two blocks, dying instantly, or he can become trapped inside the 6 with no escape, needing the timer to run out to continue.
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In Paper Mario, talking to the green Bob-omb in Kooper's house while touching the small ledge behind him may result in Mario losing the ability to do anything except slide around slowly. As he cannot open doors in this state, Mario will be trapped inside this house forever.
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