Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Added in Afterbirth

Isaac turns into a walking Mushroom after picking up three distinct items from the following list. Grants a Red Heart container.

Active Collectibles[]

Name ID Icon Quote Description Added in Repentance Quality
Added in Repentance Mega Mush 5.100.625
Mega Mush
12 rooms
I'm a big boy now! 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. 4
Added in Repentance Wavy Cap 5.100.582
Wavy Cap
0.5 seconds
Tears up. A mind changing experience! Increases tears, decreases speed, and distorts the screen. All effects become more pronounced with repeated use, and wear off by clearing rooms. 1

Passive Collectibles[]

Name ID Icon Quote Description Added in Repentance Quality
1up! 5.100.11 1up! Extra life Gives Isaac an extra life. Upon death, he will respawn in the previous room with full health and lose the 1up!. 2
Blue Cap 5.100.342 Blue Cap HP + tears up + shot speed down Removed in Repentance Gives one full Red Heart container, +0.7 tears, and -0.16 shot speed.

Added in Repentance Gives one Red Heart container, 2 Hearts of health, +0.7 tears, and -0.16 shot speed.

3
Magic Mushroom 5.100.12 Magic Mushroom All stats up! Makes Isaac bigger. Adds one Red Heart container, +0.3 damage, x1.5 damage multiplier, +5.25 range, and +0.3 speed. Restores all health on pickup. 4
Mini Mush 5.100.71 Mini Mush Speed + range up Decreases Isaac's size, making him less likely to be hit. Removed in Repentance+0.3 speed, +1.5 tear height, -4.25 range (effective range is increased). Added in Repentance +0.3 speed, +1.50 range. 2
Odd Mushroom 5.100.121 Odd Mushroom HP + DMG up, speed down Grants one empty Heart container, +0.3 damage, +0.25 range, +0.5 tear height, and -0.1 speed. 2
Odd Mushroom 5.100.120 Odd Mushroom Tears + speed up, DMG down +1.7 tears, +0.3 speed, slightly reduces damage. 3
God's Flesh 5.100.398 God's Flesh Shrink shot! Tears have a chance to shrink enemies, making them run away from Isaac. Shrunk enemies can be crushed and killed by walking over them. 1
Added in Repentance Mucormycosis 5.100.553 Mucormycosis Spore shot 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 mushrooms and a wordplay on fungi.
  • Fun Guy may be a reference to the character of the same name in Chrono Cross.
  • Fun Guy's appearance may be a reference to the character Toad, a humanoid mushroom from the Mario franchise.


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