I'd like to know the probabability of a Sacrifice Room to appear on a floor. For me it feels like 33% or 50%. Does someone have more reliable data?
The Binding of Isaac Rebirth – What Is the Chance of a Sacrifice Room Appearing on a Floor?
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Related Solutions
Its the satanic bible, on usage, gives you a black heart
Those symbols tell you, which "end boss" you have defeated with the current character.
With your Isaac, you defeated Mom's heart (heart), Satan in Sheol (upside down cross) and Isaac in the Cathedral (cross).
The red tint tells you, that you defeated them during hard mode.
In the spoiler, you'll see the rest of the symbols
1. Mom's heart | 2. Isaac | 3. Boss rush | 4. Satan | 5. ??? / Blue baby | 6. The Lamb
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Best Answer
Based on what I've found, there is no set chance to find a sacrifice room on any given floor, however, according to the wikia:
Source: http://bindingofisaac.wikia.com/wiki/Sacrifice_Room