Wobble Rock

Wobble Rocks are a type of rock platform originating from the New Super Mario Bros. sub-series.

New Super Mario Bros.
Wobble Rocks first appear in New Super Mario Bros. They are rock platforms balancing on the tip of a pillar, and when landed on, will begin weighing over to the side it was landed on, eventually falling over. They only appear in World 8-5.

New Super Mario Bros. Wii
Wobble Rocks return in New Super Mario Bros. Wii, behaving the same as in New Super Mario Bros., though they can now be re-balanced by standing on the side opposite where they were weighted down. They only appear in World 8-1.

New Super Mario Bros. U / New Super Mario Bros. U Deluxe
Wobble Rocks appear yet again in New Super Mario Bros. U and its remake. Their behavior is largely unchanged from its past appearances. They appear only in the level Walking Piranha Plants!, though they also play major roles in the challenges Balancing Act and Wobble and Rock. Wobble Rocks are among the few objects that do not return in New Super Luigi U.

Super Smash Bros. series
In Super Smash Bros. for Wii U and Super Smash Bros. Ultimate, a giant Wobble Rock comprises the Rock-Candy Mines portion of the Mushroom Kingdom U stage.