Binding of Isaac: Rebirth Wiki

Guppy's Tail is a passive item.

Effects[ | ]

  • Grants a 1/3 chance of replacing Room Clear Awards with a ChestChest or a Locked ChestLocked Chest, but also a 2/9 chance to replace it with nothing at all.
  • This item belongs to the GuppyGuppy set. Collecting three items from this set will transform Isaac into Guppy.

Notes[ | ]

  • The drawback to this item is that Keys become much more scarce, while increasing the amount of Locked Chests. This makes taking Guppy's Tail a potential liability early on.
  • Due to any found Chests containing items while in ChestChest or Dark RoomDark Room, Guppy's Tail can be a good way to quickly stack up more upgrades before facing the final boss.
  • (except in Rebirth) The effect does not apply to PennyPennies dropped in Greed Mode, meaning that this item has no effect in Greed Mode other than counting towards the Guppy Transformation.

Synergies[ | ]

  • (in Repentance)Collectible Deep Pockets iconDeep Pockets: If Guppy's Tail removes the room clear drop, it is turned into coins instead.
  • (in Repentance)Collectible Guppy's Eye iconGuppy's Eye: Makes KeyKey management easier by revealing which Locked Chests are worth opening and which are not.
  • The Left HandThe Left Hand: Turns all chests into Red ChestRed Chests, allowing Isaac to get Red Chest items much more quickly. Useful when pursuing the GuppyGuppy transformation.
  • Collectible Mom's Key iconMom's Key: Increases the number of drops from Chests and counteracts the increased chance to run into Locked Chests.
  • (in Repentance)Collectible Options? iconOptions?: Chests may be accompanied by normal room drops or other chests of a type that's easier to open, mitigating the downsides.
  • Paper ClipPaper Clip: The Key scarcity problem is completely prevented, since Paper Clip causes Locked Chests to be openable without Keys, making Guppy's Tail's only downside the chance to replace room clears with nothing at all.
    • (except in Rebirth)If Character Cain iconCain starts with the Trinket, entering Curse RoomCurse Rooms and opening Red Chests in hopes of finding Guppy's Tail early is a very effective strategy.

In-game Footage[ | ]

Trivia[ | ]

  • This item is used in Cat Got Your Tongue (challenge #8).
  • The item Collectible Dead Cat iconDead Cat has Guppy's tail be completely black while Guppy's Tail has a white fur on the tip of the tail.
  • In the Wrath of the Lamb DLC for the original game, this item had to be unlocked by beating a challenge titled "9 Deaths".