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

Guppy's Collar is a passive item.


  • Grants a permanent 50% chance to resurrect on death.
    • Resurrection leaves Isaac at 1/2 of a Red Heart, or half a Soul Heart if he had no Heart Containers.
  • This item belongs to the Guppy set. Collecting three items from this set will transform Isaac into Guppy.


  • Resurrection items activate in a set order. Guppy's Collar is 6th in this order after Added in RepentanceSoul of Lazarus Soul of Lazarus, 15►1up! 1up!, Lazarus Lazarus' extra life, 15►Dead Cat Dead Cat, and Added in Repentance15►Inner Child Inner Child.
  • It is possible to obtain two collars by finding one in a Red Chest, without picking it up, and then finding another collar in a different Red Chest. Removed in Repentance However, this does not have any additional effects and does not count towards transforming into Guppy.
    • Added in Repentance Obtaining multiple copies of Guppy's Collar now grants extra lives, depending on how many copies are obtained (obtaining a second collar displays the lives count as '2?', and so on). The chance for Guppy's Collar to activate is defined with separate rolls, but increases the odds for one of the collars to revive Isaac. Additional collars also count towards the Guppy transformation.
  • Resurrecting in a Curse Room may trap Isaac if he has no way of recovering health or exiting them without losing health.
  • Added in Afterbirth †Resurrecting via Guppy's Collar during a Daily Run will count as a death, even if the run is eventually completed.

In-game Footage[]


  • This item is a tribute to Edmund's cat Guppy. [1]
  • This item may also be a reference to the Schrödinger's Cat thought experiment.



PC RWBY 10FQ (Curse Room adjacent to spawn, in Red Chest)

PC 1CMD B881 (Curse Room adjacent to spawn, surrounded by Spiders)

PC Added in Afterbirth FM7Z 4VAJ (Curse Room adjacent to spawn, surrounded by Spiders)

PS4 FQTL 13FX (Curse Room adjacent to spawn)

Switch XSDE HE2L (First floor Curse Room)


Bug Bug! Removed in Afterbirth † When the Keeper Keeper is resurrected by Guppy's Collar, there is a chance it spawns with half a Soul Heart as health. When a health upgrade is obtained, the Keeper will have 1 coin, as well as the half Soul Heart as health. When a second health upgrade is obtained, the Keeper will lose the half Soul Heart and have 2 coins as health.
Bug Bug! Removed in Afterbirth † Guppy's Collar can be exploited to gain infinite lives. When Isaac's last will is on the screen, close the game, re-open it, and continue the run. Isaac will appear to die again, and will also have a separate chance to be resurrected.

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