Sinking and Rising Mushrooms

Updown Kinoko are a type of Mushroom Platform found in the New Super Mario Bros. sub-series.

New Super Mario Bros.
Updown Kinoko first appear in New Super Mario Bros.. They are platforms that, when stood on, either rise or fall depending on their color; yellow-and-orange ones fall, whereas orange-and-red ones rise. They only appear in World 5-4.

New Super Mario Bros. 2
Updown Kinoko return in New Super Mario Bros. 2, exhibiting the exact same behavior as in New Super Mario Bros., albeit with different color schemes; blue ones fall, whereas pink ones rise. They appear in World 5-4 and the third level of the Gold Mushroom Pack.