I love Hanabi. It is a cooperative card game, where you're not allowed to look at your own hand. Communication between players is constrained to things like poi

I love Hanabi. It is a cooperative card game, where you're not allowed to look at your own hand. Communication between players is constrained to things like pointing to all your partner's blue cards and saying "these cards are blue". What makes it deep is not only considering "what did my partner just tell me", but also "why did my partner tell this now". Indeed all sorts of wacky conventions are possible. It plays well online if you can arrange to play with the same people repeatedly.