Jar of Flies
ItemAfterbirthUnlocked
activeGame ID 434★★★★
How do you unlock Jar of Flies?
Verified starting unlockSource data confirms that no unlock is required.
Killing an enemy adds a fly to the jar, up to a maximum of 20. On use, releases Blue Flies equal to the number of flies in the jar.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Jar of Flies leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13