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The Binding of Isaac

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Title Screen

The Binding of Isaac

Developers: Edmund McMillen, Florian Himsl
Publisher: Edmund McMillen
Platform: Windows
Released internationally: September 28, 2011

AreasIcon.png This game has unused areas.
SoundIcon.png This game has unused sounds.

The Binding of Isaac is the result of putting The Legend of Zelda, Smash TV, a roguelike, and a couple of dead baby jokes into a blender...and hitting Liquefy.

An expansion pack, Wrath of the Lamb, added more enemies, more levels, more items, more dungeon features, more bosses, more unused content, and more bugs. A little later after that came another expansion pack, 'Eternal Edition', that added some more stuff.

Three years after release, a remake of the game was released, titled The Binding of Isaac: Rebirth.

Unused Sounds


A sound that probably being use for getting an item similar to The Legend of Zelda (Hence the file name).

Unused Room Layouts

When Wrath of the Lamb was released, a lot of room layouts were added; in fact, a handful of rooms were added that are never able to be seen in-game! These rooms exist only in the flash assets and their ID values are never generated in-game, but Cheat Engine can be used to reveal them. They are all fully functional; they were either purposefully left out or (most likely) omitted due to an oversight during room generation.


  • Unused Basement rooms: B1, B2
  • Unused Cellar rooms: B2


  • Unused Caves rooms: A9, AA
  • Unused Catacombs rooms: AA

The Depths/Necropolis

  • Unused Depths rooms: 9A, 9B
  • Unused Necropolis rooms: 9B

The Womb/Utero

  • Unused Womb rooms: 89
  • Unused Utero rooms: 89


Surprisingly, there are 11 unused rooms for Sheol; however, all of these rooms save for one have an equivalent in the Cathedral that is used in-game. Some of them also appear to be similar to already existing Sheol rooms.

  • Unused Sheol rooms: 52, 53, 54, 55, 56, 57, 58, 59, 5A, 5B, 5C
  • Unused Cathedral rooms: 5C

The Chest

  • Unused Chest rooms: 06, 07

Unused Items

Pumpkin Mask

The Pumpkin Mask is an Activated Item that was intended to be dropped by Krampus. It was supposed to shoot a beam in four directions. It was replaced with A Lump of Coal before the halloween update released. A similar item is obtainable in Rebirth, Krampus's Head. You are able to view the sprite by finding an undefined item, or hacking the item itself in. It's properties have been replaced with A Lump of Coal's.