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Hollow Heart

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How do you unlock Hollow Heart?

In The Binding of Isaac, Hollow Heart is unlocked by earning the Mother completion mark as Tainted Forgotten.

Structured pathSource-backed requirements are mapped into trackable steps.

Grants an empty Bone Heart upon entering a new floor.

Hollow Heart (Achievement)
- Tainted Forgotten → Mother (normal)
  1. Defeat Hush 3 times to unlock A Secret Exit. source
  2. After A Secret Exit is unlocked, a locked door to Downpour appears after completing Basement/Cellar/Burning Basement I or II. source
  3. Collect Knife Piece 1 in Downpour/Dross II. source
  4. Collect Knife Piece 2 in Mines/Ashpit II. source
  5. After defeating Mom in Mausoleum/Gehenna II, stab the flesh door that appears with the knife familiar to open it. source
  6. Defeat the Mausoleum version of Mom's Heart behind the flesh door, then reach Corpse II and defeat Mother. source
  - Tainted Forgotten

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What unlocking Hollow Heart leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13