Backasswards
ChallengeAfterbirth+Locked
Challenge details
- Challenge number
- 31
- Description
- All chapters progress in reverse order, losing 1 item and 1 Red Heart container each floor ascended.
How do you unlock Backasswards?
In The Binding of Isaac, Backasswards is unlocked by unlocking Backasswards (Achievement).
Structured pathSource-backed requirements are mapped into trackable steps.
All chapters progress in reverse order, losing 1 item and 1 Red Heart container each floor ascended.
How to unlock: [before Repentance] Defeat ??? or The Lamb / [Repentance] Defeat Mega Satan and unlock The Negative
What unlocking Backasswards leads to
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13