Big Two / Deuces
I think every Chinese person knows how to play this game. It's like a secret ethnic handshake.
As Poker combinations are key to its gameplay, you can argue that Big Two is a gateway drug, but I see it as a sublimation of Poker.
Poker is chess; Big Two is chess boxing.
Many people, however, try to win solely by knockout (punch at every opportunity could haunt you later) or checkmate (wait for the right opportunity to unleash a barrage of indomitable combos could never arrive).
Jonfucious say: "Chess box, dammit! Set aside a straight and disband a full house if necessary to trump a pair."