Battlefield Earth DELUXE with Sprites

The object of the game is to destroy as many alien ships as possible in 5 minutes. Ships are destroyed by placing the yellow target symbol on the ship and pressing the left mouse button which shoots 2 laser cannons. Scoring is as follows:

 >200 Po1nts for each alien ship destroyed

 >100 Bonus points minus 10 points for every second the alien ship is on the screen prior to destruction

 >150 Bonus points minus 10 points for every second the Mother ship is on the screen prior to destruction

 >200 Bonus points minus 10 points for every second the Electronic Transport ship is on the screen prior to destruction

 >-25 points for each alien ship of any kind that leaves the screen without getting destroyed  

 >-5 points for each time the laser cannons are fired

As you see endless firing or waiting until ships are almost off the screen can cost valuable points. Carefully choose your shots. Once the 5 minutes has elapsed your accrued bonus points will get added to your regular game points and the game will end.