Giant ? Block

From the Super Mario Wiki

Giant ? Blocks are blocks in Super Mario Bros. 3. Found in Giant Land, and in secret areas, they contained multiple 1-Up Mushrooms or various Suits, such as the Tanooki, Frog, and Hammer Suits. In Wario Land, there are giant ! Blocks that would activate something on the map screen, usually to make new levels.

They are found most recently in Toad Houses in New Super Mario Bros.. They roll through Super Mushrooms, Fire Flowers, Mini Mushrooms and Blue Shells quickly. In Mega Mushroom Houses, Giant ? Blocks also appear however they always give out Mega Mushrooms. When Mario or Luigi hits the Giant ? Block, the item that it is stopped on will be put in the player's reserve, replacing any item already there.

Blocks

! Block | ? Block | ♪ Block | 4-Bros. Random Block | Arrow Block | Aurora Block | Black Block | Blue Coin Block | Bonus Block | Brick Block | Bros. Block | Coin Block | Command Block | Control Block | Dice Block | Dotted Line Block | Drop Block | Egg Block | Event Block | Expansion Block | Giant ? Block | Giant ! Block | Grab Block | Green Block | Heart Block | Hidden Block | Hint Block | Ice Block | L Block | Laser Block | M Block | Marshmallow Block | Metal Block | Minus Block | Mushroom Block | Perry Block | Pink Block | Plus Block | POW Block | Pushing Block | Rally Block | Random Block | Red Block | Rock Block | Save Block | Shine Block | Simu-Block | Spin Block | Star Block | Stone Block | Super Block | Triangular Block | Turning Block | Used Block | Warp Block | Wooden Block | Yellow Block | Yoshi Block