Pirate ship is trying to fight with the space invaders in sea space. Evil aliens attack from above, so the most convenient way to destroy them - is to shoot up cannonballs. Aliens are not far behind, they constantly shelled the ship without giving him an opportunity to escape. After each hit, the player will disappear one of three gaming lives. For each downed alien, you will receive one point. For maneuvering the ship, use the arrows on the keyboard.