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

Isaac turns into his cat Guppy after picking up any 3 distinct items from this item pool. As Guppy, Isaac gains flight.

Removed in Repentance When Isaac or one of his familiars hits an enemy with a tear, a Blue Fly spawns.

Added in Repentance Blue Flies have a 50% chance to spawn when Isaac or one of his familiars hits an enemy with a tear.

Laser attacks from Brimstone Brimstone, Technology Technology, Added in AfterbirthTech X Tech X and Added in RepentanceUrn of Souls Urn of Souls also work normally, but Mom's Knife Mom's Knife and Technology 2 Technology 2 spawn flies only very rarely. Explosions and non-tear based attacks from familiars do not spawn flies.

Activated Collectibles[]

Name ID Icon Quote Description Added in Repentance Quality
Guppy's Head 5.100.145
Guppy's Head
1 rooms
Reusable fly hive Spawns 2-4 friendly Blue Flies that damage enemies. 3
Guppy's Paw 5.100.133
Guppy's Paw
Unlimited
Soul converter Upon use, converts one Red Heart Container into three Soul Hearts. 3

Passive Collectibles[]

Name ID Icon Quote Description Added in Repentance Quality
Dead Cat 5.100.81 Dead Cat 9 lives Sets Isaac's Red Heart containers to 1, but grants 9 extra lives. After dying, Isaac respawns with 1 Red Heart Container. 3
Guppy's Collar 5.100.212 Guppy's Collar Eternal life? Grants a permanent 50% chance to respawn with 1/2 of a Red Heart after death. 2
Guppy's Hair Ball 5.100.187 Guppy's Hair Ball Swing it Spawns a familiar that loosely follows behind Isaac, which blocks shots can be swung like a flail to damage enemies. Grows bigger by killing enemies. 1
Guppy's Tail 5.100.134 Guppy's Tail Cursed? Room Clear Awards have a 1/3 chance of being replaced with a Chest and a 1/3 chance being replaced with nothing. 2
Added in Repentance Guppy's Eye 5.100.665 Guppy's Eye An eye for secrets Shows the contents of Chests, Sacks, and Fire Places before they're opened/bombed. 2

Trinkets[]

Name ID Icon Quote Description
Added in Repentance Kid's Drawing 5.350.169 Kid's Drawing Looks familiar... While held, counts towards the Guppy transformation.


Notes[]

  • Added in Repentance If all the 9 extra lives have been consumed, Dead Cat Dead Cat is considered lost. This may even cause the transformation to be removed.
  • Added in Repentance Duplicates items still count separately towards the transformation.

Unlockable Achievements[]


Trivia[]

Seeds Disables achievements[]

PC Normal mode only XWN6 1YWH (The Basement I - Curse Room above spawn contains 2 Red Chests and Bomb Chest, Guppy's Collar, Guppy's Head and Dead Cat respectively)

PC Hard mode only JJZE PR1R (Cellar XL - Curse Room contains Guppy's Tail, Devil Deal red chests contain Dead Cat and Guppy's Collar)

PC Normal mode only 7TC3 43F1 (The Cellar I - Curse Room above spawn contains 2 Red Chests and Bomb Chest, Guppy's Collar, Guppy's Paw and Guppy's Head respectively

PC Added in Afterbirth Greed mode only W82M ZL3F (The Basement, Eden only - Start with Guppy's Head, Golden Treasure Room contains Guppy's Paw, Silver Treasure Room contains Guppy's Tail)

3DS Hard mode only F4GJ 7ZHK (The Caves II, Boss Challenge Room, three Red Chests with Guppy's Tail, Guppy's Head and Guppy's Paw)


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