An alien invasion of Earth has begun — they want to conquer your island! You are the island's only defender; you have a cannon and you need to shoot them down. The number of enemies will increase with each level and they will become even more powerful. Collect bonuses — grenades, extra lives, helicopters — to last longer. Grenades and the attack helicopter will help you destroy the flying saucers, while extra lives will let you absorb more hits from the enemy. If you run out of lives, you lose. Good luck!