Bouncy Cloud

Bouncy Clouds are cloud platforms that appear in New Super Mario Bros. Wii, New Super Mario Bros. U and New Super Luigi U. Anything that lands on them bounces very high, including enemies.

New Super Mario Bros. Wii
In New Super Mario Bros. Wii, they only appear in World 2-6 and World 9-8.

New Super Mario Bros. U
In New Super Mario Bros. U, they appear in two levels, several of them can be found in the level Bouncy Cloud Boomerangs, and a single one is found in the final level of Superstar Road, Follow That Shell!.

New Super Luigi U
In New Super Luigi U, they are also found in two levels, Above the Bouncy Clouds, and Flying Squirrel Ovation.