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Coin Boxes, also referred to as ? Boxes, are items introduced in Super Mario 3D Land. They are only found in World 8-1, World 8-4 and Special 1-3. Coin Boxes look just like ? Blocks. Like Propeller Boxes, they are worn by Mario over his head, and don't let him throw fireballs or boomerangs, or turn into a statue. It cannot be taken off unless he hits an enemy. If Mario makes it to the Goal Pole with the Coin Box, it disappears and gives an extra life. While inside a Coin Box, infinite coins will pop out from it while he is moving.
In New Super Mario Bros. 2, similar objects known as Gold Blocks appear, which are revealed by hitting Coin Blocks enough times, and give Mario coins at a much faster rate than the Coin Boxes. Unlike Coin Boxes, however, a Gold Block will disappear once 100 coins have been collected from it.
Coin Boxes return in Super Mario 3D World, now shinier than a regular ? Block. This time, they work just like Gold Blocks.
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