- Description: Unlocked Challenge #6.
- Unlock: Defeat Mom's Heart 3 times
- In-Game Secret Number: 159
|Description||Unlocked a new item.|
|Unlock|| Removed in Afterbirth: Beat Mom's Heart, Isaac, Satan, ???, and The Lamb and complete the Boss Rushon hard mode as The Lost |
Added in Afterbirth: Earn all 9 Completion Marks on hard mode as The Lost
|In-Game Secret Number||156|
|Achievement Description|| |