Boom!
ItemRebirthUnlocked
passiveGame ID 19★★★★
How do you unlock Boom!?
Verified starting unlockSource data confirms that no unlock is required.
Grants 10 Bombs.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Boom! leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13