Poison Mushrooms made their debut in Super Mario Bros.: The Lost Levels and has become a recurring item in later Mario games. They are mushrooms that deceptively resemble the Super Mushroom, but with a duller color scheme and angry eyes. In later Mario games, the Poison Mushroom's cap design features a skull-faced pattern and/or a purple color scheme.
Poison Mushrooms are known for being a harmful variety of Mushrooms where touching one will cause the player to take damage or lose a life. If a player in their Fire Flower power-up forms comes into contact with one, then they will revert back to their original small forms. If a player in their small forms comes into contact with one, then they will lose a life. In later Mario games, they can follow the player around like an enemy.
The Poison Mushroom debuted as an effect item in Super Smash Bros. Melee. It will appear on the stage and keeps sliding to the right. In Melee, it will slide left if it spawns on the right half of the stage.
The player's fighter will shrink smaller after touching it, which also feature the following effects:
The transformation lasts about ten seconds. Touching another Poison Mushroom will reset the timer. Touching a Poison Mushroom while under the effect of a Super Mushroom and vice versa will restore a character to their normal size, whereas the effects of Lightning are canceled.
In Brawl and Smash 4, the fighters strike a pose while growing/shrinking, briefly lamenting their reduced size and relishing their return to normal size. Most of the items held by the player, as well as their own projectiles, will be proportionate to their lower size. Certain attacks or charge ups can be interrupted if a Poison Mushroom touches the player in the course of doing an action.
In Ultimate, the fighters no longer strike a pose when they're growing or shrinking, making their animation similar of that to Melee. This also prevents certain attacks and animations from being interrupted when a player touches one.
Tiny battles appear as a feature in Melee's Special Smash and in later games onward, where all fighters become tiny under the permanent effects of a Poison Mushroom. In Brawl's Tiny Special Brawl, direct attacks deal around 0.48x their normal damage, and pitch can now be altered further. In Smash 4's Tiny Special Smash, fighters still deal 0.48x their normal damage with their direct attacks. If players acquire a Poison Mushroom in that game mode, their direct attacks will deal 0.34x their normal damage. In a Giant Special Smash, acquiring a Poison Mushroom lowers a fighter's damage multiplier to 0.92x.
Also, in Ultimate's Spirit Battles, players can battle a puppet fighter that is either tiny or occasionally becomes tiny.
In Smash Tour
The Poison Mushroom appears as a red trophy item. When used, it makes the player's fighter start the battle in tiny form. Using this trophy cancels the effect of a Super Mushroom trophy used by the target.
The Poison Mushroom is one of the items that can appear during a Transformation Smash.
Poison Mushrooms made their debut in Super Mario All-Stars, where they'd cost characters a life if picked up. These nasty fungi are dark and foul-tasting, and in Super Smash Bros. Melee, they make you shrink on contact. With your diminished stature comes a loss of power and mass, making you a prime target to get smashed offscreen with even a light attack.
A penalty item that shrinks whoever grabs it. It's hard to distinguish from a Super Mushroom, so you may find yourself getting small when you wanted to get big. When you're in miniature form, your attack power drops, and even the lightest attack can send you off the stage. That being said, a small target's hard to hit. Your best plan when you're tiny may be to run.
Becoming giant and looming over your foes is pretty great, yeah? Well, that won't happen if you get this mushroom. It looks a lot like the Super Mushroom, but it's a slightly different color and its face is... unhappy. If you use this mushroom, you'll shrink down and be easy to send flying.
So, you thought you'd nabbed a Super Mushroom, eh? Nope! Now you're tiny! If you'd looked more closely, you'd have seen it was a slightly different colour - it was a Poison Mushroom. Now you're mini, weak and very launchable. At least dodging's not hard when you're this size!
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