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Unofficial fan project. Not affiliated with the developers of The Binding of Isaac.

Game facts are sourced from the Binding of Isaac Rebirth Wiki (CC BY-SA), and each guide links to its sources. Your progress is saved only in this browser.

Achievement

Rotten Penny

Have 20 Blue Flies at the same time.

In-game: “Unlocked a new item.”

Sources:Achievements

0 of 1 doneNext: Rotten Penny

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Stage 1

Rotten Penny
Next up
Have 20 Blue Flies at the same time.
Have 20 Blue Flies at the same time.
Sources:Achievements