|Appearance(s)||Super Mario Bros.: The Lost Levels, Super Mario Kart Mario Party, Mario Party 3, Mario Party 5, Mario Party 7, Super Smash Bros. Melee, Super Smash Bros. Brawl, Mario & Luigi: Superstar Saga, Paper Mario: The Thousand Year Door, Super Paper Mario|
|Effect||Shrinks player (Super Mario Bros.: The Lost Levels, Super Mario Kart, Super Smash Bros. series), Effected player can only roll 1-3 on the Dice Block(1-5 in some installments).|
|Coin Cost||5 Coins(Mario Party 3)|
The Poison Mushroom has been a staple of the Mario franchise as a whole for quite a long time now. This mushroom always has some sort of negative effect in whatever Mario game its in although that negative effect varies. It made it's first appearance in Super Mario Bros.: The Lost Levels where it would cause Mario or Luigi to shrink. It also appeared in the Super Smash Bros. series where it shrinks anyone who touches it. In theses instances, it looks very similar to the Super Mushroom, making it easier to confuse the two. In New Super Mario Bros. and New Super Mario Bros. Wii, it is replaced by the Mini Mushroom
 Game History
 Super Mario Series
 Super Mario 3D Land
This would be their first appearance in a Mario platformer game in 25 years. In Super Mario 3D Land, they will act similar to enemies as they will follow Mario or Luigi around until it can no longer get to them, or it falls off the ledge. It can be destroyed by a fireball, boomerang, or transforming into a statue to make them vanish upon contact. They only appear in the Special Worlds.
The Poison Mushroom first appeared in the original Mario Party and has since made appearances in Mario Party 3, Mario Party 5, and Mario Party 7. In the original Mario Party, it didn't appear as an item, but if you picked it on the Mushroom Space, you would lose a turn. In Mario Party 3, it limits the numbers on the Dice Block to 1-3. It costs 5 coins and is a rather common item. The effects of the Poison Mushroom could be nullified through the use of items like the Mushroom, Golden Mushroom, and Warp Block. In Mario Party 5, it was actually named the Cursed Mushroom and it limited the numbers on the Dice Block to 1-5. Like other Mushrooms in the game, it was represented by a mushroom symbol on the space it was placed on. In Mario Party 7, it was not an item per se, but rather something Koopa Kid would sometimes give you if you landed on a Koopa Kid Space in order to make life harder for you. It limited the numbers on the Dice Block to 1-5.
 Paper Mario Series
|Appearances||Paper Mario: The Thousand-Year Door,Super Paper Mario|
 Paper Mario: The Thousand-Year Door
This mushroom would be seen in Paper Mario: The Thousand-Year Door. It could be created from mixing a Slow Shroom and Inky Sauce/Point Swap or Trial Stew and Dried Bouquet from Zess T.. When Mario eats this mushroom, they will lose health instead of gaining health. They would also gain the Poison status ailment though there is a small chance of this in battle, but it can heal all HP instead. Though the Feeling Fine badge(s) are required for this. It is also one of the pictures that the player can earn in battle, and if all appear together, then Mario's HP, FP, and SP are all halved and half the audience members will leave.
Ghost T. also died because he ate a Poison Shroom on the Excess Express.
 Super Paper Mario
They would return in Super Paper Mario, with a more prominent appearance. It can be dropped by Zombie Shrooms, Cursyas, and their relatives. It can be used more in recipes like it can produce a Dangerous Delight.
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