Help Biff get rid of the space zombies! Use the "A" key to fire a laser in the direction you are walking. The "S" key fires a rocket in the direction of the mouse. The "D" key lets you drop a bomb down. Biff runs in the direction of the mouse. Crystals are worth 1 and zombie kills are worth 3. Get to 50 points to win!
advanced costume handling, simple sound playing, functions, simple loops, basic math, simple messaging, simple events, visibility, graphic effects, delays,