A Boss Room (Gemini) in the Binding of Isaac: Rebirth (BOIR)
Isaac VS Gemini. This screen is a good indicator that you have entered a Boss Room.

The Boss Room is a type of Room in The Binding of Isaac: Rebirth (TBOIR)

In this room, you will fight the Boss of the level

You need to defeat the Boss before you can proceed to the next floor.


  • Boss rooms often contain blood, rocks, or Poop

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