Biff needs to grab 100 crystals from the graveyard without being touched by the enemy. Every time you are touched, you will lose 1 life out of 9 lives. When you press the space bar on the keyboard, you will plant a bomb. When an enemy touches the bomb, they will be eliminated. If you press the up button on the keyboard then you will shoot a laser. If the laser hits an enemy, then they will be eliminated. When you press the down button on the keyboard, you will fire a rocket. Whenever you touch a crystal or destroy an enemy, then you will score 1 point out of the 100 needed points. Have fun, and good luck!
advanced costume handling, simple sound playing, functions, simple loops, basic math, simple messaging, simple events, visibility, graphic effects, delays,