With a faint slam, the door closes behind Rachel Larson.
The St. Paul woman inches forward as her eyes adjust to the dark. Slowly, she can make out her friends, then some of the details of the eerie room: a chessboard, a toy rifle, a large crate.
She hears the door lock and turns to see a man in black-rimmed glasses standing guard at the door. He holds a small timer.
"Did we already start?" she asks. The man doesn't answer.
Larson and her friends are trapped.
And that's exactly what they signed up for.
Each player has paid $25 ($26.87 with the service fee) to be imprisoned for an hour in Minneapolis' first Riddle Room.
In this live-action game, titled "Escape From the Bunker," players have 60 minutes to find clues scattered around the black-lit room and solve a series of riddles that will lead them to the key — and freedom.