To unlock the challenge, you have to unlock Sacrifial Dagger, not only defeat Moms Heart 11 times
Unlock[]
I unlocked this challenge after unlocking it lives. Is this unlock requirement correct or did they change it in ab+ or repentance
Unlock for Repentance[]
The Entry says that the Challenge is unlocked by defeating Satan and ??? as Eve, but instead of ??? it should be Lamb. I don't know how to edit the Infobox, would be nice if someone could correct that.