You took shots be placing a dot on your side of the field opposite of where you wanted to shoot. Next you would fold the paper over and push hard with the pen on the back side of the paper. This would transfer the dot across the field, causing a shot. That would hurt the character if it hit it, until it was dead and scratched out.

The point of the game was to be the last person standing.

http://www.neoflash.com/forum/index.php/topic,4950.0.html