Mini Mushrooms are items that make the user smaller than usual, which is the opposite effect of most other Mushrooms.
Mario Party 4
The Mini Mushroom first appeared in Mario Party 4. In this game, these are items that make characters smaller. With this they can fit through special pipes, although the player's Dice Block is limited to rolls between 1 and 5.
Mario Pinball Land
The Mini Mushroom reappears with the same look in Mario Pinball Land as a way of getting into small places, once again. They normally cost ten coins.
New Super Mario Bros. series
The item reappeared in New Super Mario Bros., they make Mario or Luigi very small, thus weakening their gravitational pull and allowing them to jump even higher. If the bosses of World 2 and 5 are defeated by Mini Mario, Worlds 4 and 7 are unlocked. Mini Mario can also access certain hidden areas through small pipes, filled with Tiny Goombas. With this power-up, if the player is hit once they die.
The Mini Mushroom reappears in New Super Mario Bros. Wii with the same effects.
In both games, the Mini Mushroom takes on a new look, now looking just like a normal Mushroom, except being the color blue.
Mario & Sonic at the Olympic Winter Games
The item reappears in the Nintendo DS version of Mario & Sonic at the Olympic Winter Games. It is found in Polastraits, Icepeak, and Blizland. The point of it is so that Mario can skate across ice without being to big and weigh too much. Otherwise, Mario would break the ice and fall through. Sonic cannot use this item; only Mario can.
Mario Sports Mix
The Mini Mushroom once again appears in Mario Sports Mix. This time, the item is not helpful and rather a bad item to be hit with. If a player uses it on the opponent, the opponent will be too small to carry nearly any ball, and won't be able to spike a volleyball. They also are unable to do defensive maneuvers in dodgeball, making it easier to hit them.
Gallery
 Power-ups in the Super Mario series 
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