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I know the typical rule that if you don't lose any hearts (or red hearts if you have red AND white/silver/black hearts) you can get a Devil Deal Room after a boss fight, but something odd happened the last time I played.

I was playing as Eve (with the curse activated) and I only had the standard 3 red hearts. So I was battling one of those snake thing bosses on the first floor (with both the curse and Monstro's Lung which I had gotten earlier) and I lost a whole heart at one point but I still got a Devil Deal Room.

I don't know if I got it because I defeated it pretty fast or because the Eve character just has that attribute, but I'd like to know why so I can strategize when I play again.

Thanks!

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According to the Rebirth wikia, there is only a 1% base chance for the Devil Room door to open. This chance can be increased in various ways:

Devil Room chances

This means that if you get damaged (this regards ONLY red hearts) during the boss fight you only decrease the chance to open a Devil Room, but there's still a small chance to find it anyway.

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  • 1
    Was planing almost this exact answer, but took too long in thinking how to repesent the content from the wiki nicely here ;)
    – djsmiley2kStaysInside
    Dec 6, 2015 at 19:27
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    @djsmiley2k LOL, I thought that a screenshot would have been a good solution :)
    – pinckerman
    Dec 6, 2015 at 19:29
  • It's perfect, just didn't occur to me :D
    – djsmiley2kStaysInside
    Dec 6, 2015 at 19:30
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With pinckermans answer you know what factors influence your chances. But there is a handy overlay for Rebirth, which displays your current chance for a devil or angel deal (+ your other relevant stats).

It updates live, right when you pick up items, take damage etc. It's not really a mod, so it won't disable any achivements.

Link to the GitHub overview page

Link to the released versions

Example screen

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  • Good idea, I was thinking the same.
    – pinckerman
    Dec 7, 2015 at 22:34

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