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The Twins

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How do you unlock The Twins?

In The Binding of Isaac, The Twins is unlocked by earning every normal-mode completion mark as Tainted Lilith.

Structured pathSource-backed requirements are mapped into trackable steps.

Adds a chance to duplicate one of Isaac's familiars when entering a new room.

See the full unlock path for The Twins — 7 steps

The Twins (Achievement)
- All of
  - Tainted Lilith → Isaac (normal)
  - Tainted Lilith → ??? (normal)
  - Tainted Lilith → Satan (normal)
  - Tainted Lilith → The Lamb (normal)
    1. Defeat Satan 5 times to unlock The Negative. source
    2. The Negative is a guaranteed drop from Mom; take it, then defeat Satan in Sheol and touch the chest to enter Dark Room. source
    3. Find and defeat The Lamb in Dark Room. source

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What unlocking The Twins leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13