Recognize the entrance
What the doorway looks like
The reflective surface is the entrance to the Mirrored World. Keep it intact for the return trip.
Downpour / Dross mirror

Original game-art examples, shown facing upward where relevant. Door textures and appearance can vary with the floor or item effects.
Related machines and beggars
Compare payments, rewards, and bombing effects relevant to this room. These references are not a guaranteed spawn list.
Related curses and floor objects
Useful interactions, possible drops and route decisions. These connections are not a guaranteed spawn or reward list.
Where this entrance fits in the run
An entrance cost is only one step. Check the floor's preparation, checkpoint and continuation.
Find the entrance
How to enter Mirror Room
Touch the floor's white fire to enter ghost form, then pass through the mirror. Certain ghost characters can enter directly.
What you can find
Rewards and opportunities
Knife Piece 1 in the mirrored Treasure Room, plus an optional repeat boss fight.
Mother route and Knife PiecesBefore you commit
The risk to plan around
Keep the mirror intact. Destroying it cuts off traversal and can end the run if you are inside the mirrored world.
- Most mirrored special rooms are empty.
- Return through the mirror after collecting the Knife Piece.
Useful connections
Items that affect this room
Reference
Repentance rules and room variants
This guide describes the room type. Exact layouts and contents can vary. The rules use Repentance references; Repentance+ can change them.

