A game called Mad Experiments: Escape Room is currently in closed beta and seeking beta testers.
Description:
You have been “invited” by Professor Cheshire and his assistant Hildegarde to try their new experiments. They are obsessed with people’s minds and want to see how you react to their experiments. Explore and solve puzzles with your friends in this multiplayer escape room game!
You’ll need to fill in a form to receive a Steam Key (apparently within 24 hours).
No obvious deadline to acquire a Steam key has been provided.