Number One
ItemRebirthUnlocked
passiveGame ID 6★★★★
How do you unlock Number One?
Verified starting unlockSource data confirms that no unlock is required.
Grants +1.5 tears, but severely reduces range.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Number One leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13