Instructions: Choose how many human players you want, how many computer players you want and how many rounds you want to play, from the above options menu.  The default is one human and one computer.  You must click the mouse cursor somewhere in the option menu box before you press enter to start the game or the game won't start.  Press the left or right arrow key to aim your cannon to the left or right.  Press the up or down arrow key to control the range (distance) of your shot and the space bar to shoot.