Stage bonus is one of the many bonuses awarded in Daily Challenges, and is pretty straightforward: a fixed value given to each floor you reach. To reach a floor, you need to clear the previous one.
|Floor reached||Bonus points|
|Cathedral / Sheol||3,000|
|Chest / Dark Room||4,000*|
* The Chest and The Dark Room will not yield any "floor bonuses" by themselves, but you do get 4,000 points for killing Satan or Isaac, or otherwise reaching the 11th floor
Therefore, by reaching these floors, the total Stage bonus gained is as follows:
|Floor cleared||Total bonus|
|Cathedral / Sheol (reached)||16,000|
|Cathedral / Sheol (boss killed)||20,000|
|Chest / Dark Room||20,000|
When playing a daily it is possible to obtain a full 20,000 Stage bonus even if the set objective is lower by using a sacrifice room.