Wobble and Rock
From the Super Mario Wiki
Wobble and Rock is a Special Challenge in New Super Mario Bros. U. The course takes place in front of a castle, resembling The Final Battle from Peach's Castle. It's a harder version of Balancing Act.
The player must balance and stay on the Wobble Rock, which tilts and turns depending on where they are standing, for as long as possible without jumping. The player must stay on for at least ten seconds without falling into the pit to pass the level.
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