Bellwether Games has released a free print-and-play version of their game Antidote.
From the website:
In Antidote players face a self-imposed time limit simulating a deadly toxin rapidly spreading through the body. Players must work together to deduce the antidote before the toxin takes effect, but wrestle internally to give up any secret information.
In the game, players simultaneously share, steal or declassify their research. All manner of player interaction is encouraged, but only a perceptive player can successfully navigate the web of verbal and non-verbal communication to deduce the final answer.