The old school game of Tetris is perfect for a little competition among friends. You can play it right here!
Set your party guests up for a little competition in Tetris and see who gets the high score. Here is a good browser version of the game:
Get a prize.
If you are going to throw a little contest, you should think about getting a little prize for the winner. Something fun and Tetris related preferably.
Make it into a drinking game.
Every time someone breaks a line, everyone watching have to do a shot. You can also make up some other rule on when to drink.
Computer party games