Donut Block

A Donut Lift is a kind of platform first appearing in Super Mario Bros. 3. They get their name from the fact that they are round (except for the top) with a hole in the middle. If Mario or Luigi stands on one for more than a second, it drops below, often into lava. For this reason, Mario and Luigi should avoid touching the ground by Jumping as much as possible when crossing Donut Lifts.

They appear again in Super Mario World 2: Yoshi's Island and Mario vs. Donkey Kong 2: March of the Minis, where they do the same thing.