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Rotten Penny achievement in The Binding of Isaac: Rebirth

Rotten Penny

Unlocked a new item.

Rotten Penny0
12 May 2018 - 1 guide
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How to unlock the Rotten Penny achievement

  • redjarmanredjarman41,556
    15 Jul 2020 01 Aug 2020 01 Aug 2020
    1 0 0
    This is unlocked by having 20 blue flies at once.

    There are many ways of spawning blue flies in the game, but the easiest way to ensure you have them all at the same time is to use the Jar of Flies item. For every kill you get, a fly is added to the jar, once there are 20 inside, just use it to release them all at once.
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