Madonna of Sorrow

2-3 Cathedral, upstairs: on the pedestal of the room where you meet up with your partner, after the last laser-mirror room.

Blue piece. With the Madonna of Grief it goes on the blue pedestals at the edge of the 3rd-floor balcony: it opens a secret stairway behind the altar dais.

Mirror rooms: each player aims their laser sight at a plate until it glows. In the last one the plate shows in the ceiling mirror; you can also aim at it directly.