The Poison Mushrooom is an item in Super Mario Bros.: The Lost Levels. In it, it either power-downs Mario or Luigi (from Fire Mario to Super Mario, or from Super Mario to regular Mario), or causes Mario to lose a life. In Super Smash Bros. Melee and Super Smash Bros. Brawl it reduces the size of the player temporarily. It is very difficult to tell a Super Mushroom from a Poison Mushroom. However, a Super Mushroom is brighter red and Poison Mushrooms have an angry face. When your size is reduced you willSuper Mushroom but a hard target to hit. The slightest hit (when small) will KO you even if its a standard attack. If you are playing a Tiny Melee or Mini Brawl and you get hit by a poison mushroom it is hard to see yourself; you are almost microscopic!