The Rotten Mushroom is a purple, zombie-like Mushroom introduced in Super Mario Maker 2. It is similar in function to a Poison Mushroom in that it damages the player character upon contact, but it will actively follow Mario, Luigi, Toad, or Toadette instead of moving in a set direction like a Poison Mushroom and can even jump up one-block high ledges. If the Rotten Mushroom is prevented from reaching the player character somehow, such as by walls, it will instead go in the same direction as the player character as far as it is able. If the player character is under the effects of a Super Star, Rotten Mushrooms will run away from them until it wears off.