Obviously, for a drinking game you need at least two players, but the game does support up to six players. You can, certainly, play on your own, provided that you're fairly far gone to begin with. To play it you pick one can of beer for each round and shake it up vigorously, then return it to the others and spin the six cans so that they are shuffled until nobody knows which is the shaken-up one. Now the fun part, each player then chooses one can of beer and opens it, in reality, the players should hold it so that the one who got the shaken-up beer gets sprayed with beer. In the iPhone game, there are sounds and graphics to enjoy, and of course it is up to the gang to decide how the spay in real world (or any other punishments) should take place! The players who weren't sprayed laugh, and finish their beers. As a compensation, the player who got sprayed gets to shake up the can in the next round. The game continues until nobody can shake the can. Enjoy the game, just don't blame us when you wake up with a hangover the next morning and find your iPhone is broken or lost, LOL.