83 BLUE ROOM. The ceiling tiles give off blue, instead of white light. The floor is tiled in black and white squares, except for the very center, which is tiled in blue and darker blue. This area hides a secret trap door in the floor.
The area under the floor is a four foot cubic mini-room holding three bags of 50 gold crescents each and three unlabeled potions of heroism (blue, tastes of strawberries, smells of salt).