Kaboom Pirate Cannon Game Instructions- Sink the five ships on the horizon with only nine cannonballs or less! Use your up, down, left, and right arrow keys on your keyboard to adjust your cannon. Use the gauge on the lower right to help you aim. SURPRISE- pressing the down arrow key moves the barrel of the cannon higher and may help your cannon ball hit a ship farther away. Once your aim is just right, hit your spacebar to fire the cannon. This is a simple game, but it is very hard to win.