The Binding of Isaac

The Binding of Isaac
Developers: Edmund McMillen, Florian Himsl Publisher: Edmund McMillen Platform: Windows Released internationally: September 28, 2011 This game has unused areas. This game has unused graphics. This game has unused items. This game has unused sounds. This game has unused text. This game has revisional differences. This game has a bugs page

The Binding of Isaac is the result of putting The Legend of Zelda, Smash TV, a roguelike, a couple of dead baby jokes, and lots of poop 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.

Sub-Pages

Bugs

Unused Graphics

A door leading to a spiraling staircase downwards. Could've possibly been an early version of the trap doors used to travel from floor to floor in the final game.

A much earlier and crude version of the loading screen artwork.

Unused	Used

Unique sprites for the Eternal Pooter, originally made prior to the decision that no new sprites were going to made for Eternal Edition.

Unused Tiles

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Various different tiles of unknown purpose. The last 4 were added in the Wrath of the Lamb DLC.

Unused Items

Pumpkin Mask

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  The Pumpkin Mask

The Pumpkin Mask is an active item that was intended to be dropped by Krampus. It was supposed to shoot a Brimstone beam in four directions, but was later replaced with A Lump of Coal before the Halloween update was released. You're able to view the sprite by finding an undefined item, or hacking the item itself in. Its properties have been replaced with A Lump of Coal's.

An item with a similar effect, Head of Krampus, is obtainable in Rebirth.

Unused Sounds

The Binding of Isaac features a number of unused sounds. A good amount of them are alternates or retakes of used sounds or sounds reused from Edmund McMillen's prior works, particularly Super Meat Boy.

Name	Sound	Comments
boss2intro_remote_alarm.wav		A very grating alarm. Seems like it would've introduced a boss during the versus screen.
Bullet_Shot0.wav		A bullet being fired. Resembles a sound the Blaster enemy appearing in Antibirth and later Repentance uses.
Bullet_Shot1.wav		Another take on the bullet shot sound; see above.
bum shootoff.wav		A duplicate of Bullet_Shot1.wav. The filename implies it was intended to be used when bums fly away ("shoot off") after giving them enough money, which doesn't have a sound effect in the final release.
fetus_flyingwhoosh.wav		An intense whooshing sound. The "fetus" part of the filename may be referring to Dr. Fetus, the antagonist of Super Meat Boy.
Fetus_Whistle.wav		A quick tongue-whistling sound. See above for the "fetus" part.
Monster_Grunt_3_A.wav		A low, rumbling monster grunt.
Monster_Grunt_3_B.wav		An alternate take on the above sound.
Monster_Yell_B_3.wav		A particularly guttural sound of a monster yelling.
Monster_Yell_B_4.wav		Another yell.
Monster_Yell_B_6.wav		A more subdued yell.
pillgoodeffect.mp3		An alternate take on the "good pill effect" sound effect used in the game.
pillpickup.mp3		A sound that might've played when you picked up a pill.
Powerup_Zelda_Headlift.mp3		A sound parodying the iconic "item get" jingle as heard in The Legend of Zelda (hence the name). Likely would've played when Isaac gets an item and holds it above his head.
Retro_keypickup.wav		A small positive retro beep. Perhaps an earlier version of the game's final key pickup sound.
Rocket_Launch.wav		A high-pitched laser-sight like noise that leads into the fiery sound of a rocket being launched. Perhaps could've been used with the Epic Fetus item. A very similar sound was implemented later with the rocket-firing effect of the Rocket in a Jar item first introduced in Antibirth and then appearing in Repentance. This sound can also be heard in one of Edmund's previous games, Super Meat Boy.

Unused Text

A number of curious text entries can be found in the game that don't see any use. These were used for floor layout names.

Text	Comments
	Eary name for the Sheol chapter. The "7th Circle" refers to the 7th Circle of Hell in Dante's Inferno, a realm of violence.
	Early name for the Caves chapter.
	Early name for the Cathedral chapter.
	Early name for the Depths chapter.
	Early name for the Necropolis chapter.
	Early name for special rooms.
	Early name for the Womb chapter.
	Early name for the Utero chapter.

beam!

Random text string that says "beam!" in pink.

Death!

"Death!" is the default value for item names in the game's hud.

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 Adobe 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.

Basement/Cellar

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

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  Basement Room B1

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  Basement Room B2

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  Cellar Room B2

Caves/Catacombs

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

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  Caves Room A9

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  Caves Room AA

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  Catacombs Room AA

The Depths/Necropolis

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

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  Depths Room 9A

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  Depths Room 9B

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  Necropolis Room 9B

The Womb/Utero

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

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  Womb Room 89

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  Utero Room 89

Sheol/Cathedral

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

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  Sheol Room 52

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  Sheol Room 53

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  Sheol Room 54

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  Sheol Room 55

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  Sheol Room 56

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  Sheol Room 57

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  Sheol Room 58

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  Sheol Room 59

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  Sheol Room 5A

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  Sheol Room 5B

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  Sheol Room 5C

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  Cathedral Room 5C

The Chest

• Unused Chest rooms: 06, 07

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  Chest Room 06

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  Chest Room 07

Demo Save File Oddities

If you have a save file present that has stuff unlocked, it will appear in the menus of the demo despite not accessing them. This also means that if unlocked, Isaac will start with the D6, even on the demo. Clicking one of the endings will simply show a black screen which can be left by hitting space. Afterwards the credits will play which always shows the first version even if the boss It Lives is unlocked.

Revisional Differences

Main Menu

• The demo has a skip button for the cutscene, while the final excludes this button, requiring hitting Space to skip.
• Text saying "The Demo!" is added on the title.
• Isaac's hand is not seen in the lower left corner of the menus in the demo, despite the shadow being present.
• A Newgrounds ad is placed just under the game's logo
• A link to the right side to buy the game on Steam is present
• The options button is broken, only being accessible from the pause menu.

Menu Credits

• The demo has Danny on the page in the upper left corner of the credits, while the final moves his text down with the sound effects credit.
• Text giving permission to use the game in monetized content was placed in the upper left corner.

Game End Credits

Original Release	Wrath of the Lamb

• An additional credit for "Jules Conroy" has been added.
• On a few pages some enemies originally did not animate such as the fly.

Options

Demo only has detail, mute, and music, while the final adds different screen sizes with the fullscreen option.

Pause

The pause menu in the demo adds the same Newgrounds, and full game links from the title screen.

Error Room

Normally the error room can only be accessed with the Telepills, but in the demo this room can be accessed with the item known as Teleport, or one of the tarot cards that can teleport you into another room.

Bosses

Original Release	Wrath of the Lamb

The veins and such at the top of It Lives! are drastically stretched vertically starting with Wrath of the Lamb.