Binding of Isaac: Rebirth Wiki

Disambig.png This article is about the large odd mushroom. For the smaller mushroom, see Odd Mushroom (Thin).

Odd Mushroom (Large) is a passive item.


  • Removed in Repentance Gives Isaac one empty Heart container.
  • Removed in Repentance +0.3 damage.
  • Removed in Repentance +0.25 range.
  • Removed in Repentance +0.5 tear falling speed.
  • Removed in Repentance -0.1 speed.
  • Makes Isaac's head larger, which on its own is only a visual effect.
    • If taken when Isaac is smaller than the default, this Mushroom also increases his hitbox slightly.
  • Added in Afterbirth This item belongs to the Fun Guy set. Collecting three items from this set will transform Isaac into a walking mushroom.


  • There are two collectible items in the game named Odd Mushroom; you can tell them apart from the sprites.


  • Removed in RepentanceThe Virus The Virus: The speed down from the Virus does not stack with the Odd Mushroom; if both are collected, only a total of -0.1 applies.

In-game Footage[]


PC CH0T JNLO (First Secret Room to the left of the Treasure Room)

PC J1S1 MKKL (First floor Treasure Room)

PC 1SJM PBG6 (Treasure Room adjacent to spawn)

PC Added in Afterbirth STDX QSC8 (Two items in Treasure Room adjacent to spawn - Mushroom is on the right)

PS4 BPR1 KMWS (Treasure Room adjacent to spawn)

PC P14Y 8CAT (First floor Treasure Eoom) Mac Added in Afterbirth TMK3 C3JN (Normal mode only Treasure Room two rooms up of spawn; Hard mode only Treasure Room to the right of spawn)