I just found out about this awesome "Video Game". So, one player is at a computer, and he needs to diffuse a bomb, Hollywood style. It has all sort of bomby-puzzles. Thing is, he needs the manual to solve them, and he doesn't have it.
So, other player (1-5) have the manual - either printed, or on their phones, or over skype on another computer - but they are not allowed to see the actual bomb. Goal is to communicate and diffuse it together. Manual is complex enough that it cannot be easily memorized (too many steps in each puzzle), and it gets progressively harder, so I am not too worried about complexity, esp as you can play it with new people.
I played it for few hours this afternoon with my nephew, and it was a BLAST (pun intended). We got through easy levels and really to stuck at moderate ones - time limits are a bitch. Extremely fun, recommend it to everybody.
We could even try it here.