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.



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.

  • 1
    Was planing almost this exact answer, but took too long in thinking how to repesent the content from the wiki nicely here ;) – djsmiley2k - CoW Dec 6 '15 at 19:27
  • 1
    @djsmiley2k LOL, I thought that a screenshot would have been a good solution :) – pinckerman Dec 6 '15 at 19:29
  • It's perfect, just didn't occur to me :D – djsmiley2k - CoW Dec 6 '15 at 19:30

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

  • Good idea, I was thinking the same. – pinckerman Dec 7 '15 at 22:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.