In this game you're a geek who has gotten himself involved in a beer pong match. Throw the ball in your enemy's cups. If the ball lands in a cup your opponent has to empty that cup. Take out all of the frat boys by making sure you're less drunk than they are. Play until they pass out. when they do you'll get to draw on their faces with a marker.
Use the mouse. Move the mouse outside of the screen to return to the main menu from the instructions menu.