Super HTML5 Brothers/Poison Mushroom
|First appears in..||World 1-1 (Expert Mode only)|
|Origin game||Super Mario Bros 2: The Lost Levels|
The Poison Mushroom is, as the name suggests, a harmful version of the Mushroom power-up. It first appears in Super Mario Bros 2: The Lost Levels. It is not seen in the normal versions of the game, only being seen in Expert Mode, where they replace all 1-UP Mushrooms.
When Mario touches the Poison Mushroom, he will shrink, losing his Super/Fire Flower ability, or die if he is small. The Poison Mushroom can be avoided by simply jumping over it, or using a Starman to run over it. It cannot be defeated with Fireballs.