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Title Screen

Boba/Rebirth

Developers: Nicalis, Edmund McMillen
Publisher: Nicalis
Platform: Windows
Released internationally: November 4, 2014


AnimationsIcon.png This game has unused animations.
AreasIcon.png This game has unused areas.
CodeIcon.png This game has unused code.
DevMessageIcon.png This game has a hidden developer message.
CopyrightIcon.png This game has hidden developer credits.
DevTextIcon.png This game has hidden development-related text.
GraphicsIcon.png This game has unused graphics.
MusicIcon.png This game has unused music.
SoundIcon.png This game has unused sounds.
DebugIcon.png This game has debugging material.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.


This cactus is UNDER CONSTRUCTION
This article is a work in progress.
...Well, all the articles here are, in a way. But this one moreso, and the article may contain incomplete information and editor's notes.
Notes: WRITE ALL OF THIS IN THE CONTEXT OF REBIRTH.
<Sanky> please suggest an unused sprite with a clock or something
This game is still under active development.
Be aware that any unused content you find may become used or removed in the future. Please only add things to the article that are unlikely to ever be used, or went unused for some time. If they do get used, please remove them from the page and specify in the edit summary!

The Binding of Isaac: Rebirth is a remake of the Binding of Isaac that doubles the amount of content, introduces console players to its special brand of dead baby jokes, brings in an all-new soundtrack courtesy of Ridiculon, and frees itself from the painful bonds of ActionScript 2.0.

Contents

Sub-Pages

IsaacAfterbirthIcon.png
Afterbirth
The first DLC expansion for Rebirth. They didn't keep the old man!
IsaacAfterbirthPlusIcon.png
Afterbirth+
Confusing name and all, this is the second DLC expansion for Rebirth, requiring Afterbirth.
IsaacRepentanceIcon.png
Repentance
The third and final (for real this time) DLC expansion for Rebirth, requiring Afterbirth+. The time has come to repent.

Developer Message

The following message found in readme.txt warns those snooping in the files not to spoil the game for others.

You might wonder how you can open those .a files. Currently there are no
tools available, and there is a reason to it.

Binding of Isaac: Rebirth has a lot of content that is unlocked as you
progress. It also contains some secrets.
We felt that having a folder with all the spritesheets, cutscene videos,
data files and whatnot would be too tempting for people to ignore.
Finding out things while playing the game, either alone, with friends,
or as part of an online community can be a very rewarding experience. We
don't want to take that away from you.

In case you like reverse engineering and absolutely want to take this
beautiful game apart, we would ask you a few things.
 - Don't release any secrets you find to the internet.
 - Don't publish information on how to open the game's data files.
 - Don't give away the unpacked resources.
The least you can do is wait until the game has been released for a
couple of months, so you don't accidentally spoil it for others.

If you have any questions, write to isaac@nicalis.com.

Despite this warning, tools later became available in Afterbirth+.

Development Comments

Cutscene Comments

Hmmm...
To do:
Redo the video.

The file that stores information for cutscenes contains "temporary texts" that describe what is happening in most of the cutscenes. However, these are commented out. If you restore them and watch a cutscene in-game, a placeholder screen will appear instead of the cutscene, unless the cutscene itself had no temporary text to begin with. The screen displays a title and description on a glowing gray background.

Ending name ingame Ending name internally Description
Credits Credits Credits sequence.
Epilogue Epilogue
-
End 1 Womb (Eden) Isaac crawls into the big chest, and re-emerges as Eden
End 2 Womb (Rubber Cement) Isaac finds Rubber Cement in the big chest
End 3 Womb (Noose) Isaac finds a Noose in the big chest and hangs himself
End 4 Womb (Wire Coat Hanger) Isaac finds a Wire Coat Hanger in the big chest.
End 5 Womb (Everything is Terrible) Isaac gets pulled into the chest by mom's hand. Everything is Terrible.
End 6 Womb (Ipecac) Isaac finds IPECAC in the big chest.
End 7 Womb (Experimental Treatment) Isaac finds Experimental Treatment in the big chest.
End 8 Womb (A Quarter) Isaac finds A Quarter in the big chest.
End 9 Womb (Dr. Fetus) Isaac finds Dr. Fetus in the big chest
End 10 Womb (???)
-
End 11 Womb (It Lives!)
-
End 12 Sheol While Isaac looks at the chest, he cycles through all characters and shows a demonic form of himself. He goes into the chest and closes it from inside.
End 13 Cathedral Isaac is seen reading the bible. He looks into the mirror and sees a demonic form of himself.
End 14 Chest A bunch of polaroid photos from Isaac's childhoold(sic) are shown.
End 15 Dark Room A telephone pole in front of Isaac's house shows a missing poster featuring Isaac.
End 16 Mega Satan Isaac is inside the chest and randomly flashes from his normal form to a demon form.

Achievement Comments

Most achievements have comments explaining how to unlock them, as well as temporary text that was meant to be a placeholder for the in-game achievement images. A good amount of these don't match up with the final.

The Womb

<!-- beat Mom for the 1st time -->
<achievement id="4" text='You unlocked "The Womb" -Chapter 4- Mother sleeps' gfx="Achievement_TheWomb.png" />

The Womb's temporary text contains the additional tagline "Mother sleeps".

Transcendence

<!-- beat Mom's Heart 3 times (A Noose = Transcendence) -->
<achievement id="8" text='"A Noose" has appeared in the basement' gfx="Achievement_Transcendence.png" />

Transendence is referred to as "A Noose" in the temporary text. Additionally, Transendence is also referred to as "A Noose" in the Steam achievement.

The Nail

<!-- beat Boss Rush with Demon Isaac -->
<achievement id="9" text='"The Nail" has appeared in the basement' gfx="Achievement_TheNail.png" />

The Nail's comment refers to Azazel as Demon Isaac.

Dr. Fetus

<!-- beat Mom's Heart 9 times (A Fetus in a Jar = Dr. Fetus) -->
<achievement id="11" text='"A Fetus in a Jar" has appeared in the basement' gfx="Achievement_AFetusInAJar.png" />

Dr. Fetus is referred to as "A Fetus in a Jar" in the temporary text. Dr. Fetus is also referred to as "A Fetus in a Jar" in the Steam achievement and the in-game achievement image.

Super Bandage

<!-- make a super bandage girl (A Bandage = Super Bandage) -->
<achievement id="19" text='"A Bandage" has appeared in the basement' gfx="Achievement_SuperBandageGirl.png" />

Super Bandage is referred to as "A Bandage" in the temporary text. Super Bandage is also referred to as "A Bandage" in the Steam achievement.

The Relic

<!-- kill Isaac with Maggy (A Cross = Relic) -->
<achievement id="20" text='"A Cross" has appeared in the basement' gfx="Achievement_TheRelic.png" />

The Relic is referred to as "A Cross" in the temporary text. The Relic is also referred to as "A Cross" in the Steam achievement.

Sack of Pennies

<!-- kill Isaac with Cain -->
<achievement id="21" text='"A Bag of Pennies" has appeared in the basement' gfx="Achievement_CoinBag.png" />

Sack of Pennies referred to as "A Bag of Pennies" in the temporary text. Sack of Pennies is also referred to as "A Bag of Pennies" in the Steam achievement. Sack of Pennies is reffered to as "Coin Bag" in the in-game achievement image.

Razor Blade

<!-- kill Satan with Eve -->
<achievement id="44" text='"The Razor" has appeared in the basement' gfx="Achievement_TheRazor.png" />

Razor Blade is referred to as "The Razor" in the temporary text. Razor Blade is also referred to as "The Razor" in the Steam achievement and the in-game achievement image.

Bomb Bag

<!-- kill Satan with Cain -->
<achievement id="46" text='"A Bag of Bombs" has appeared in the basement' gfx="Achievement_BombBag.png" />

Bomb Bag is referred to as "A Bag of Bombs" in the temporary text. Bomb Bag is also referred to as "A Bag of Bombs" in the Steam achievement.

Demon Baby

<!-- beat Dark Room with Demon Isaac -->
<achievement id="47" text='"A Demon Baby!" has appeared in the basement' gfx="Achievement_DemonBaby.png" />

Demon Baby's comment refers to Azazel as Demon Isaac.

Celtic Cross

<!-- beat The Chest with Maggy (Crucifix = Celtic Cross) -->
<achievement id="50" text='"The Crucifix" has appeared in the basement' gfx="Achievement_CelticCross.png" />

Celtic Cross is referred to as "The Crucifix" in the temporary text.

Dad's Key

<!-- collect a golden key -->
<achievement id="58" text='"Dad's Key" has appeared in the basement' gfx="Achievement_DadsKey.png" />

Dad's Key's comment indicates that the original unlock method was collecting a Golden Key. In the final, it is unlocked by obtaining both Key Pieces.

Counterfeit Penny

<!-- Play the shell game 100 times -->
<achievement id="64" text='"Counterfeit Coin" has appeared in the basement' gfx="Achievement_CounterfeitPenny.png" />

Counterfeit Penny is referred to as "Counterfeit Coin" in the temporary text. Bomb Bag is also referred to as "Counterfeit Coin" in the Steam achievement.

Platinum God

<!-- collect all items in the game and unlock all secrets and endings minus "the soul" and its 5 unlockable items -->
<achievement id="69" text='!Platinum God! OMG!' gfx="Achievement_PlatinumGod.png" />

Platinum God's comment refers to The Lost as The Soul.

Azazel

<!-- make 3 deals with the devil in one run -->
<achievement id="79" text='You unlocked "Demon Isaac"' gfx="Achievement_Azazel.png" />

Azazel is referred to as "Demon Isaac" in the temporary text.

The Lost

<!-- finish the game's final secret -->
<achievement id="82" text='You unlocked "The Soul"' gfx="Achievement_thelost.png" />

The Lost is referred to as "The Soul" in the temporary text.

Rune of Berkano

<!-- Beat Challenge #7 -->
<achievement id="95" text='"Rune of Berkano" has appeared in the basement' gfx="Achievement_RuneOfBerkano.png"/>

The Rune of Berkano's comment indicates that the original unlock method was beating Suicide King (Challenge #7). In the final, it is unlocked by beating Purist (Challenge #20).

Missing No.

<!-- Beat Challenge #20 -->
<achievement id="105" text='"Missing No." has appeared in the basement' gfx="Achievement_MissingNo.png" />

Missing No.'s comment indicates that the original unlock method was beating Purist (Challenge #20). This is further evidenced by Missing No.'s Steam achievement icon using the Challenge unlock background color. In the final, it is unlocked by beating Boss Rush as Lazarus.

Suicide King

<!-- beat Boss Rush with Lazarus -->
<achievement id="120" text='"Suicide King" has appeared in the basement' gfx="Achievement_SuicideKing.png" />

Suicide King's comment indicates that the original unlock method was beating Boss Rush as Lazarus. This is further evidenced by Suicide King's Steam achievement icon using the Boss Rush unlock background color. In the final, it is unlocked by beating Suicide King (Challenge #7).

Satanic Bible

<!-- kill Isaac with Demon Isaac -->
<achievement id="126" text='"Satanic Bible" has appeared in the basement' gfx="Achievement_SatanicBible.png" />

Satanic Bible's comment refers to Azazel as Demon Isaac.

Daemon's Tail

<!-- kill Satan with Demon Isaac -->
<achievement id="127" text='"Daemon's Tail" has appeared in the basement' gfx="Achievement_DemonTail.png" />

Daemon's Tail's comment refers to Azazel as Demon Isaac.

Abaddon

<!-- beat Chest with Demon Isaac -->
<achievement id="128" text='"Abaddon" has appeared in the basement' gfx="Achievement_Abaddon.png" />

Abaddon's comment refers to Azazel as Demon Isaac.

D100

<!-- beat Boss Rush with The Lost -->
<achievement id="133" text='"A D100" has appeared in the basement' gfx="Achievement_D100.png" />

D100 is referred to as "A D100" in the temporary text.

Missing Poster

<!-- beat Dark Room with Isaac -->
<achievement id="149" text='"The Lost Poster" has appeared in the basement' gfx="Achievement_LostPoster.png" />

Missing Poster is referred to as "Lost Poster" in the temporary text. Missing Poster is also referred to as "Lost Poster" in the in-game achievement image.

Wrapped Baby

<!-- beat Mom's Heart on hard mode with Lazarus -->
<achievement id="172" text='You unlocked "Wrapped Baby"' gfx="Achievement_WrappedBaby.png" />

Wrapped Baby's comment indicates that the original unlock method was beating Mom's Heart on Hard mode as Lazarus. In Rebirth, it is errornously unlocked by beating Mom's Heart on Hard mode as Azazel. This was fixed in Afterbirth+.

Begotten Baby

<!-- beat Mom's Heart on hard mode with Azazel -->
<achievement id="173" text='You unlocked "Begotten Baby"' gfx="Achievement_BegottenBaby.png" />

Begotten Baby's comment indicates that the original unlock method was beating Mom's Heart on Hard mode as Azazel. In Rebirth, it is errornously unlocked by beating Mom's Heart on Hard mode as Lazarus. This was fixed in Afterbirth+.

Sisters Vis

<!-- beat Sheol 10 times -->
<!--<achievement id="179" text='You unlocked "Sister's Vis" in Sheol' gfx="Achievement_SistersVis.png" />-->

There exists an extra, commented out achievement for the boss Sisters Vis. The achievement indicates that they were to be found in Sheol, which only houses Satan as its boss. They would later be added as a normal boss in Afterbirth+.

Removed Items

There's a few gaps between item IDs due to items being either partially or completely removed from the game. While some of these were previously in the original game, others indicate items being removed at a later point.

Item #43 - Pills Here!

Isaac rebirth collection pillshere.png

Has no description. Leftover of the Pill "item" that was present in the original game's collection menu. Also has a collection menu image.

Item #59 - Wiggle Worm

Isaac rebirth collection wiggleworm.png

Completely removed, minus the collection menu image. Wiggle Worm was an item in the original game, but was converted into a trinket for Rebirth.

Item #61 - Tarot Card

Isaac rebirth collection tarotcard.png

Has no description. Leftover of the Tarot Card "item" that was present in the original game's collection menu. Also has a collection menu image.

Item #235

Completely removed from the game.

Item #263

Completely removed from the game. This ID's spot would later be filled by Blank Rune, an item added in Repentance.

Trinket #47 - The Polaroid

Completely removed, minus the image of the trinket itself, which is 1:1 with the item version. The Polaroid was a trinket in the original game, but was converted into an item for Rebirth.

Unused Rooms

Hmmm...
To do:
Re-rip Rebirth, and check all the rooms with the Afterbirth+ room editor. If that doesn't work, find a different room editor.

These are rooms that are not associated with any floor, so they will never be encountered.

DEFAULT_0 test room

BOIRebirthTestRoom.png
Room Type: DEFAULT
Floor: Special Rooms
Room ID: 0
Room Name: test room
The first room in the game by ID. Contains 12 random pedestal items and 8 random trinkets.

DEFAULT_1 New Room

BOIRebirthTestRoom2.png
Room Type: DEFAULT
Floor: Special Rooms
Room ID: 1
Room Name: New Room
The second room in the game by ID. Contains four Gaping Maws and many spikes.

Unused Graphics

There's a lot of graphics that aren't used in the final, some of which that even have animations!

Hmmm...
To do:
Remove DLC content here. A lot of these need to be re-ripped, rewritten, or are just plain false. Search for more.

Items

Unused graphics related to items in-game.

Book of Belial Flash Popup

Binding of Isaac Rebirth Original BookOfBelial.png

It's the Book of Belial popup from the original game! In Rebirth, the popup instead takes on an appearance similar to its item icon. Something to note is that the filename for this image refers to the item as the "Book of Beast".

This graphic would later be reused in Repentance.

The Jar's Extra Storage

IsaacRebirth thejar rebirth.png

The Jar has additional frames for holding up to 10 hearts! In the final, it can only hold up to 4.

Breath of Life Animation

Isaac rebirth breathoflife charge.png

Breath of Life has an unused animation that almost completely mimics Chocolate Milk's. Unlike Chocolate Milk's animation, there's a final frame for Isaac holding his breath for too long and becoming blue. The finished effect for Breath of Life is instead a gradual change of Isaac's skin tone, from perky pink to hold-my-breath blue.

Bosses

Bosses have a few hidden surprises in their spritesheets, some of which came to be through the magical process of recoloring sprites for boss alts.

Steven's Umbilical Cord

IsaacRebirthStevenDot.png

Steven's spritesheet contains an umbilical cord sprite similar to that of Gemini's. Unlike Gemini's umbilical cord, it has no associated animation file.

Early Fistula Segment

IsaacRebirthFistulaSection.png

An early version of Fistula's small segment. It more closely resembles Fistula's small section in the original game.

Peep Faces

IsaacRebirthPeepFace.png

Head-only sprites for Peep, including some unique expressions.

The Cage's Vomit

Rebirth-Cages vomiting attack.png

The Cage's spritesheet, there are a few sprites that make up a uniquely recolored version of Mega Fatty's vomit-beam. It has no animation file.

The Angels' Boss Intro Names

BOIRebirthAngelNames.png

Unused boss intro screen names for the two Angel minibosses, actually named "Uriel" and "Gabriel", can be found grouped together with other boss intro screen names. Since these minibosses are immediately spawned by bombing angel statues, they don't get an intro, meaning these names are never used nor needed.

Mega Satan 2 Face

Isaac rebirth mega satan face.png

Mega Satan 2 looking rather distraught. This specific frame is the only one not used.

Mega Satan 2's Hands

IsaacRebirthMegaHand.png

A skeletal version of Mega Satan's hand. Mega Satan 2 never spawns hands, rendering this unused.

Sisters Vis

IsaacRebirth bossname sistervis.png
Boirebirth 1980.png

There's a boss intro screen name for a boss named Sisters Vis (though it's incorrectly spelled Sister Vis here). Sisters Vis also has an in-game achievement image and (commented) unlock requirement.

Sisters Vis were finally finished and released in Afterbirth+, though they are unlocked through a different method and do not appear in Sheol.

Grid

Objects that are placed in a grid-like fashion, such as rocks, are referred to as grid objects. With that being said, there's a lot of unused grid objects.

Early Tinted Rocks

BOIRebirthTintedRockAlt.png
BOIRebirthTintedRockAltDepths.png
BOIRebirthTintedRockAltSecret.png
Basement
Cellar
Caves
Catacombs
Cathedral
Depths
Necropolis
Sheol
Secret Room

Most of the floors' rock tilesets have early tinted rock graphics. These conspicuous tinted rocks are very similar to the ones used in the original game.

Unused Tinted Obstacles

BOIRebirthTintedVaseBasement.png
BOIRebirthTintedVaseCellar.png
BOIRebirthTintedMushCaves.png
BOIRebirthTintedMushCatacombs.png
BOIRebirthTintedSkull.png
BOIRebirthTintedVaseCathedral.png
BOIRebirthTintedMushSecret.png
Basement Cellar Caves Catacombs Depths
Necropolis
Sheol
Cathedral Secret Room

There are tinted versions of every chapter-specific obstacle, but none of them are used in the game. Interestingly, the icons for The Catacombs and The Necropolis Steam achievements use these.

Early Indestructible Rocks

Early versions of the indestructible rocks, used in prototype versions of the game.

BOIRebirthDarkRockBasement.png
BOIRebirthDarkRockCathedral.png
Basement Cathedral

Reward Plate

BOIRebirthPlateUnpressed.pngBOIRebirthPlatePressed.png

This button obstacle, while officially implemented in Afterbirth, has been coded and usable since day one. While it functions similarly, its outputs are different:

Effect Approximate
Chance
Nothing 35%
Spawn a random chest 29%
Spawn 6 Attack Flies 20%
Spawn 6 Troll Bombs 10%
Activate Curse of Darkness for the rest of the floor 3%
Spawn a random pickup 2%
Spawn 15 random coins 1%

If there are any enemies in the room, the button can't be pressed -- this includes the flies that the button spawns.

Half Black Heart

BOIRebirthHalfBlackHeart.png

A half-heart version of the black heart. It's not even coded as an existing entity.

Florian Himsl

BOIRebirthFlorianHimsl.png

Florian Himsl is still on the intro image, right next to Edmund McMillen, but is never shown in-game.

Tear Cursor

Binding of Isaac Rebirth Other Cursor.png

By enabling the Mouse Cursor mode on the game's "options.ini", it shows the cursor with four arrows (the one on the left). The "classic" Windows cursor is never used.

Unused Gamma Menu

Binding of Isaac Rebirth GammaOption.png

Graphics found on the main menu folder contains a more advanced gamma settings. In-game, you can only change the gamma and that's it, and pressing on the option won't cause the menu to change to another, since it's implemented inside the "Options" menu. It also has its own animation file.

Unused Item on the Collection Page

Binding of Isaac Rebirth Missing Poster Collection.png

On the collection page image, the last item seems to be a "Missing Poster", however, the Missing Poster is a trinket item in the game, so this icon is never seen on the Collection table or when the game is paused. Strangely enough, the item isn't found just next of the previous item in the sheet image, it actually breaks a line after the Dog Food (last item seen in-game via the menu).

Unused Exploded Doors

Binding of Isaac Rebirth burst curse room.png

In-game, when Isaac drops a bomb on a door, the door will explode and will load a different sprite (a burst door), letting the player skip the room. However, not all doors from all floors can be destroyed with bombs. In the game files, almost every (except the Devil Room door) single door has a burst sprite. This is likely a result to copy and paste data (since most of these has the "Basement" coloring scheme), not matching the special door associated with it.

However, doors for "Curse Rooms", "Arcade Rooms" and doors from the "Chest" and "Dark Room" rooms have burst sprites, even though none of these are possible to explode. The Dark Room doors is actually a complete copy and paste from the Sheol Room, however the game loads the door_21_darkroomdoor and not the one from Sheol. Images were cropped to only show the burst part of these sprite sheets. In order: Curse Room, Arcade Room, Dark Floor Room and Chest Floor Room.

Unused Dice Room Door

Binding of Isaac Rebirth dice room door.png

It seems that originally, the Dice Room door would have a red-ish scheme (somewhat similar with the color scheme from the Womb/Utero). This change was probably made for the player to not know the existence of the room unless they open it with two keys (in-game, both Library and Dice Rooms requires two keys to open, and the Dice Room does not have any special color, it uses the color from the current floor).

Unused Item Pools

Hmmm...
To do:
Reevaluate.

A few unused item pools exist, with some even existing since Rebirth. Despite this fact, they've all been updated to contain Afterbirth+ items. All existing pools can be seen in Afterbirth and onward by picking Chaos.

Key: Rebirth, Afterbirth, Afterbirth+

challenge

An item pool containing bomb related items.

Boom! Mr. Boom Mr. Mega Bobby-Bomb Bomb Bag
Remote Detonator Bob's Curse Butt Bombs Sad Bombs Mama Mega!
Fast Bombs

bossrush

An item pool containing... even more bomb related items.

Boom! Mr. Boom Mr. Mega Bobby-Bomb Bomb Bag
Remote Detonator Bob's Curse Butt Bombs Sad Bombs Bomber Boy
Scatter Bombs Sticky Bombs Curse of the Tower No. 2 Explosivo
Glitter Bombs Fast Bombs

dungeon

An item pool containing Mom-related items.

Lunch Dinner Dessert Breakfast Rotten Meat
Mom's Underwear Mom's Heels Mom's Lipstick Mom's Bra Mom's Pad
Mom's Eye Mom's Bottle of Pills Mom's Contacts Mom's Knife Mom's Purse
Mom's Coin Purse Box Mom's Key Mom's Eyeshadow Mom's Wig
Mom's Perfume A Snack Mom's Pearls Mom's Box Moldy Bread
Mom's Razor

Regional Differences

Hmmm...
To do:
This is Afterbirth. Change it to the Afterbirth page.

Secrets

Aside from the obvious change in language, the Korean secrets (in-game achievements) use different images for Cat Got Your Tongue and Everything is Terrible 2. Interestingly Ultra Greed has a beard like in early screenshots.

English Korean
Cat Got Your Tongue IsaacRebirth-secret-161eng.png IsaacRebirth-secret-161kor.png
Everything is Terrible 2 IsaacRebirth-secret-246eng.png IsaacRebirth-secret-246kor.png

Unused Audio

Hmmm...
To do:
There's more. Rewrite. These are wrong.

The Binding of Isaac: Rebirth has some unused audio found with the help of Afterbirth+ modding tools.

Early Boss Rush Outro

An early outro for the track 'Ambush' played in the Boss Rush room.

Early Angel Room Appearance Jingle

Oldest version of the jingle that plays when an Angel Room appears.