Stretch Shroom

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

New Super Mario Bros.
Stretch Shrooms first appear in New Super Mario Bros. They only appear in World 5-A, being blue platforms. They shrink and expand periodically, pulling anything on the ends of the platform to the center when they contract.

New Super Mario Bros. Wii
Stretch Shrooms return in New Super Mario Bros. Wii, behaving the same as in New Super Mario Bros., though they are now colored pink. They only appear in World 4-5.

New Super Mario Bros. 2
Stretch Shrooms reappear in New Super Mario Bros. 2, behaving identically to previous games. They only appear in World 6-3.

New Super Mario Bros. U / New Super Mario Bros. U Deluxe
Stretch Shrooms appear yet again in New Super Mario Bros. U and its remake. Its behavior is largely unchanged from its past appearances. It appears in the levels Dry Desert Mushrooms, Seesaw Shrooms, and, reprising the second aforementioned role in the challenge Rickety Sprint. Stretch Shrooms are among the very few objects that do not return in New Super Luigi U.