??? (Floor)

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Font TeamMeat qmark.pngFont TeamMeat qmark.pngFont TeamMeat qmark.png

Stage's starting room
(chapter 4.5)
Table dividing line 1.png
Normal and hard modes only 13
Normal and hard modes only 9
Added in Afterbirth
Disambig.png This article is about the chapter. For other uses, see ??? (Disambiguation). For other uses, see ??? (Disambiguation).

???, referred to as Blue Womb or Dead Womb in the OST, is a chapter added in The Binding of Isaac: Afterbirth. It is unlocked by defeating Mom's Heart for the 10th time.

It is accessed by defeating Mom's Heart or It Lives! within 30 minutes. Leaving and re-entering the Boss Room after the timer has reached 30 minutes will make the entrance to ??? disappear.
If the player is fast enough, both Boss Rush and ??? can be completed in a single run. The boss of the floor is always Hush.

It contains the following:

  • 4 Locked Chests in the main room.
    • Unlike the ones in The Chest The Chest, these are just regular golden chests and don't guarantee an item drop.
  • 2 locked Treasure Rooms, both of them offering two choices of items as if More Options More Options was active.
  • A Shop that always contains 6 items, even if Shop Upgrade Lvl. 4 has not been unlocked.
  • A 2x2 boss room that contains Hush.
    • The door leading to the boss room might blend in with the northern wall but will slide away upon approaching it.

It is advised to only enter ??? with very powerful items and/or a set of good dodging skills because Hush ranks amongst the most difficult bosses of the entire game.

After Hush is defeated, one of two things will happen:

  • If this is the first time Hush has been defeated, a giant golden chest will appear in the middle of the room. Jumping into it ends the run and gives ending 17.
  • If Hush has been defeated before, a trapdoor and a beam of light leading to Sheol Sheol or the Cathedral Cathedral will appear.
    • If Hush has been defeated before but Sheol and the Cathedral have not been unlocked, the giant golden chest will appear instead.
    • Added in Afterbirth † Additionally, an exit will spawn in the corner of the room, containing a Portal leading to The Void The Void.


Boss Hush.png



  • The displayed name of the chapter is ???, but the chapter is referred to as Blue Womb by the achievement, using the same logic as the character ???.
  • The character ??? and the chapter ??? have the same unlock requirements.
  •  ??? is unique as the only chapter that can be optionally done between mandatory chapters.
    • Added in Afterbirth † It is mandatory, however, to complete this chapter to unlock The Void The Void.
  •  ??? is the smallest chapter, only containing 6 normally accessible rooms.
  • In Isaac's last will, ??? is referred to as "some barren place".
  •  ???'s icon on the progress bar is actually a recolor of The Womb The Womb's.
    • Similarly, The trapdoor leading to ??? is a recolor of the trapdoor leading to the first and second floor of Chapter 4.



The ???'s music is called Mater Prope or Nativitate. These names are in Latin and translate to "Almost Mother" and "Birth" respectively.

The tracks that play during the battle against Hush are called Ascension (the ??? boss fight music; played during Hush's first phase, which is similar to the ??? boss) and Morituros (during the second phase).

Binding of Isaac: Afterbirth OST


Bug Bug! Attempting to open the door leading to Hush's room while holding a Golden Key will cause Isaac to walk through the door without opening it, immediately beginning the Hush fight.

Mom's Heart Unlocks Mom's Heart Unlocks Mom's Heart Unlocks
A NooseA QuarterA Fetus in a JarA Halo???Everything Is Terrible!!!It Lives!Wire Coat HangerIpecacExperimental TreatmentRubber CementDarkness FallsSolar SystemSuicide KingDemo ManLost BabyCute BabyCrow BabyShadow BabyGlass BabyWrapped BabyBegotten BabyDead Baby-0- BabyGlitch BabyFighting Baby Goat Head BabyBlue WombSuper Greed BabyBlue Bomber Pokey MansSmelterBurning BasementMarrow
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Optional Chapter 5 Chapter 6 Endgame
Normal mode only
Hard mode only
Stage The Basement icon.png Stage The Caves icon.png Stage The Depths icon.png Stage The Womb icon.png Stage Sheol icon.png

Stage Cathedral icon.png
Stage Dark Room icon.png
Dark Room

Stage The Chest icon.png
The Chest
The Basement The Caves The Depths The Womb
Stage The Cellar icon.png Stage The Catacombs icon.png Stage Necropolis icon.png Stage Utero icon.png ??? Stage The Void icon.png
The Cellar The Catacombs Necropolis Utero ??? The Void
Stage Burning Basement icon.png Stage Flooded Caves icon.png Stage Dank Depths icon.png Stage Scarred Womb icon.png
Burning Basement Flooded Caves Dank Depths Scarred Womb
Greed mode only
Greedier mode only
Stage The Basement icon.png Stage The Caves icon.png Stage The Depths icon.png Stage The Womb icon.png Stage Sheol icon.png The Shop Ultra Greed
The Basement The Caves The Depths The Womb Sheol The Shop Ultra Greed
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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