After obtaining three mushroom items from the following list ( 3 items with the mushroom item tag), Isaac turns into a walking Mushroom and grants a Red Heart Container.
Gigantifies Isaac for 30 seconds, increasing damage and range while lowering tears, granting invulnerability, and allowing Isaac to crush enemies and obstacles he walks on. The effect persists between rooms.
Decreases Isaac's size, making him less likely to be hit. +0.3 speed, +1.5 tear falling speed, -4.25 range (effective range is increased). +0.3 speed, +2.5 range.
Gives Isaac the chance to fire spore tears that stick to enemies and blow up after a few seconds, dealing damage and poisoning nearby enemies and releasing more spores.
3
Trivia[ | ]
The name Fun Guy is a slang term for psychedelic Psilocybin mushrooms and a wordplay on "fungi".
Fun Guy's appearance may be a reference to the character Toad, a humanoid mushroom from the Super Mario franchise.