Mr. Boom
ItemRebirthUnlocked
activeGame ID 37★★★★
How do you unlock Mr. Boom?
Verified starting unlockSource data confirms that no unlock is required.
[Before Repentance] Places a Mr. Mega Bomb that deals 110 damage. / [Repentance] Places a Mr. Mega Bomb that deals 185 damage.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Mr. Boom leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13