In the new type of room similar to the challenge room, you are hurt whenever you enter or leave (there are teeth in the doorway). In this room, there was a red chest, and the room was styled similarly to the Devil Room.
What's special about red chests – how are they different from silver/grey and gold chests?
Best Answer
The red chest can generate a random content. Please notice that they can't be found exclusively in the new challenge rooms, they can also replace normal/golden chests. Until now I've found the following:
Another thing I've found: a "toothed" room, if connected to a secret room, will have another toothed door that brings you there. Be sure to have at least one bomb to break the secret room's walls, or you'll lose another whole heart to get out.