The Binding of Isaac: Antibirth Wiki
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Chapters are sets of floors that contain similar enemies, themes, bosses, and difficulties. Chapters are divided into two floors.

Antibirth introduces four new chapters, which come with higher risk in exchange for higher reward. After unlocking "A Secret Exit", locked doors to the new chapters will appear upon defeating bosses in the first three chapters.

Chapter 1[ | ]

Downpour
Downpour

Chapter 2[ | ]

Mines
Mines

Chapter 3[ | ]

Mausoleum
Mausoleum

Chapter 4[ | ]

Corpse
Corpse

Notes[ | ]

Bugs[ | ]

Bug Bug! If any of the chapters are XL, it will be floor 1 instead of both floors combined. The floor still contains 2 treasure rooms, a Knife Piece and 2 bosses but the trapdoor leading to the next floor instead leads to the second floor of that chapter.
SmallIsaacChaptersSmallIsaac
Chapter 1 Chapter 2 Chapter 3 Chapter 4
Stage downpour
Downpour
Stage mines
Mines
Stage mausoleum
Mausoleum
Stage corpse
Corpse

Sacdag Antibirth Sacdag

Boss Baby Plum Bosses MainPageChallenges Challenges MainPageChapters Chapters Character Characters Book of Virtues Items
Dumpling Monsters Bucket Objects Immortal Heart Pickups Blessed Penny Icon Trinkets MainPageAchievements Unlockables
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