A Poison Mushroom is an item in the Mario series that, if obtained, will power-down or kill your player (the same as if touched by an enemy). It first appeared in Super Mario Bros.: The Lost Levels in Japan. It looks similar to a regular Super Mushroom, and thus could trick the player into collecting it. Apparently this is one of the many reasons why the game wasn't released in America or Europe - because it proved to be a challenge to many gamers. It's latest appearance was Super Mario 3D Land for the Nintendo 3DS.
When the night theme is activated (or if the moon course part is placed), 1-Up Mushrooms transform into Poison Mushrooms.
Super Smash Bros. series
The Poison Mushroom also appears in Super Smash Bros. series. The red on it is a little bit darker than a Super Mushrooms and its eyes look evil. A fighter shrinks when he or she touches it.
Super Smash Bros. for Nintendo 3DS / Wii U
- 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.
- Super Nintendo - Super Mario Bros.: The Lost Levels - 08/1993
- Nintendo 3DS - Super Mario 3D Land - 11/2011