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|This article refers to content that can be found within the game files but never used in the game.|
From this article, it contains a list of few features that never used in The Binding of Isaac games. However, they still can be found within the game files as well as the artbook for the original The Binding of Isaac game.
The Binding of Isaac
From the top center of the artbook on page 2, there is also a monster called "Mirror Demon". It resembles a demon with three eyes, sharp fangs, and short horns. Its only known attack is spitting out 3 projectiles.
Due to its slight similarities with the Evil Twin enemy, it is unknown if it was just an early version of the Evil Twin.
A list of unused room layouts.
Basement rooms: B1, B2
Cellar rooms: B1
Caves rooms: A9, AA
Catacombs rooms: AA
Depths rooms: 9A, 9B
Necropolis rooms: 9B
The Womb rooms: 89
Utero rooms: 89
Sheol rooms: 52, 53, 54, 55, 56, 57, 58, 59, 5A, 5B, 5C
Cathedral rooms: 5C
The Chest rooms: 06, 07
Unused 12 Room Charge
By editing the game's "items.xml" file and setting an item to maxcharges=12, the 12 room charge bar can be seen in-game. In Afterbirth, the 12 room charge bar is used for Mega Blast.
Breath of Life Animation
Unused Jar Charges
Old Man Keeper
- Main article: Old Man Keeper
Old Man Keeper is a playable character who was intended to be added in the Afterbirth DLC. It was assumed that he is ultimately replaced by Keeper.