"Forget transit cops: A new installation lets you play private eye in the subway. This diabolical interactive artwork by 31 Down Radio Theater puts participants in the middle of a murder mystery unfolding in the Canal Street stop. The piece, titled Canal Street Station, has a toll-free number you can dial from any of the pay phones there. A voice says that she’s just committed a murder, and that you need to find her somewhere in the platforms connecting the J, M, Z, N, Q, R, W and 6 trains. You’ll be asked a specific question about that location, you hang up, snoop, then call back with your answer. If correct, you’ll be told where to go for your next call."
This game runs indefinitely and can be played anytime. Free.
Check the website for more details.