A Cannon Box is an item that appears in the Wii U game Super Mario 3D World. Cannon Boxes are first found as ? Blocks, but after being hit once, the actual Cannon Box is revealed. The player can then hit it once again, causing them to wear it over their body. The color of the Cannon Box changes to match the character that is wearing it. While using a Cannon Box, characters can fire cannonballs from a cannon on the front of the box.