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Binding of Isaac: Rebirth Wiki

Added in Repentance
Disambig.png This article is about the trinket that creates Blue Womb rooms. For the trinket that opens the Hush fight and empowers Pandora's Box, see Strange Key.

Blue Key is a trinket added in The Binding of Isaac: Repentance.

Effects[]

  • Entering a room that requires a key does not consume a key, but brings Isaac to a room resembling ??? ???, which acts as an in-between of the two rooms.
    • These rooms contain assortments of Blue Gapers, Blue Boils, and/or Blue Conjoined Fatties, and are always long rooms (either normal or slim). They have a chance to give a reward when cleared, like normal rooms.
    • Once exited, the room cannot be re-entered.

Notes[]

  • Doors that were unlocked with the trinket have a blue hue emitting from them instead of the normal floor-dependent hue.
  • The doors leading to the entrance of Downpour Downpour or Dross Dross can be unlocked for free by Blue Key, though the blue room generated will be a dead end. Leaving the way Isaac came in will leave the door unlocked, allowing the player to continue normally.
  • Rooms that require money to enter (Arcades or rooms affected by 15►Pay to Play Pay to Play) can also be opened for free.
  • Doors that require two keys to open, such as Vaults or Dice rooms, will be opened instantly instead of waiting for the animation of both keys to be used.
  • The door leading to Hush will also produce a blue room, despite not requiring a key.

Synergies[]

  • Door Stop Door Stop/15►Mercurius Mercurius: The blue room can be exited without fighting the enemies, and the door will remain unlocked.

In-game Footage[]

Trivia[]

  • The trinket is most likely a reference to SCP-860, a fictional key that acts in a near-identical manner.

Bugs[]

Bug Bug! If used with The Forgotten and Birthright, leaving The Forgotten's body in the hallway will cause it to reappear next to you when you exit, but upon switching back to the body, it will become immobile, and switching back to the soul will make it immobile too, causing a softlock requiring you to exit then continue the run.


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