Your planet has been invaded by the dreaded four-pronged alien race. It's up to you to stop this menace before they kill everyone! You GOAL is to reduce enemy spacefighter numbers to less than 15% to win the game.

***Warning*** your planet's communications have been severely damaged, so information about enemy numbers is hard to come by. Information is only sent to you if atmospheric conditions are right.

The total number of enemy fighters varies from game to game. Look out for the very fast moving greenblob ship - it changes direction when you least expect it.

Try to catch the yellowblobs with the letter 'S' inside them - they will help boost your shield levels.