? Block

A ? Block is a big yellow block with a big white question mark on it. If you hit it, a Power-Up will most likely come out, such as a Super Bell, Super Mushroom, Super Leaf, Fire Flower, Double Cherry, Mega Mushroom, or 1-Up Mushroom.

Trivia

 * Some ? Blocks may not contain Power-Ups. Some contain only coins.
 * Some ? Blocks do not appear in certain episodes.