Binding of Isaac: Rebirth Wiki

Chapters are sets of floors which contain similar enemies, themes, bosses, and difficulties. Earlier chapters are divided into three floors, while later chapters contain one floor. Each chapter has different environments which, while retaining the same feel, have slightly different themes, enemies, bosses, and difficulties. Each environment also has its own music.

Chapter 1

Basement Cellar Burning Basement
Basement Basement Cellar Cellar Added in Afterbirth Burning Basement Burning Basement

Chapter 1.5 (Alternative)

Downpour Dross
Added in Repentance Downpour Downpour Added in Repentance Dross Dross

Chapter 2

Caves Catacombs Flooded Caves
Caves Caves Catacombs Catacombs Added in Afterbirth Flooded Caves Flooded Caves

Chapter 2.5 (Alternative)

Mines Ashpit
Added in Repentance Mines Mines Added in Repentance Ashpit Ashpit

Chapter 3

Depths Necropolis Dank Depths
Depths Depths Necropolis Necropolis Added in Afterbirth Dank Depths Dank Depths

Chapter 3.5 (Alternative)

Mausoleum Gehenna
Added in Repentance Mausoleum Mausoleum Added in Repentance Gehenna Gehenna

Chapter 4

Womb Utero Scarred Womb
Womb Womb Utero Utero Added in Afterbirth Scarred Womb Scarred Womb

Chapter 4.5 (Optional/Alternative)

??? Corpse
Added in Afterbirth ??? ??? Added in Repentance Corpse Corpse

Chapter 5

Cathedral Sheol
Cathedral Cathedral Sheol Sheol

Chapter 6 (Optional)

Chest Dark Room
Chest Chest Dark Room Dark Room

Endgame (Optional)

The Void Home
Added in Afterbirth † The Void The Void Added in Repentance Home Home

Level Generation

For the technical details of how each level / floor is generated, see Level Generation.