Poison mushroom

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.

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.

Trophy Descriptions

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