Each game has 10 volleys. A volley is when player 1 gets a chance to shoot, and player 2 has the opportunity to return a shot. Each player starts out with 10 weapons, and they are used up as the game continues. To exit the game at any point, hit the ESC 'Escape' key.
The game is over when all the weapons have been fired (10 volleys). The player with the most points wins. Points are awarded based on accuracy of the shot and the damage potential of the weapon. Most weapons use explosions to cause damage... the closer the tank is to the center of an explosion, the more points you get. If you shoot the other tank, you receive points. If you shoot yourself with a weapon, you lose points from your score.