the game that bored people play on msn; i.e. you have a normal conversation, someone puts a :D or :) once, and then the other person puts a :D or :); whoever puts a (sn) first, wins.
Helen: Hello, want to play the happy snail game?
Helen: How are you?
Apple: I'm fine.. :D
Helen: Me too :D
*few seconds later*
Apple: Dammit! You *ALWAYS* win this game..