? Block is an item found within the Super Mario Bros. series. It is rumoured that the ? Blocks are citizens of the Mushroom Kingdom that were turned to stones and bricks in order to make up each level Mario travels on. Whether instruction manuals are cannon is up for debate, but it is interesting to imagine that there is some history related to the block.
The ? Block is also known as the item block. They are the most helpful and common item in the Mario series. By jumping or attacking the block it causes it to release coins or other items such as mushrooms, fire flowers or stars among other power-ups. There are also hidden ? Blocks throughout each game which grants you bragging rights with your friends should you find them.
Also ? Block once caused a bomb scare in Ravenna, Ohio.