Wobble Rock

Wobble Rocks are a type of rock platform originating from the New Super Mario Bros. sub-series. They wobble from left to right when the player stands towards one of its edges.

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 New Super Mario Bros. U Deluxe. 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.

Donkey Kong Country: Tropical Freeze
Wobble Rocks appear in Donkey Kong Country: Tropical Freeze in Crumble Cavern, where they are pushed from left to right by overfalling streams of water.

Yoshi's New Island
A few Wobble Rocks appear in Yoshi's New Island, specifically in certain areas in the level Cruise the Clouds. They behave the same as in the New Super Mario Bros. games.

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.