2 Lists are made, one for X positions and one with Y positions. So item 1 of XPositions and item 1 of YPositions make the coordinates of the first 'virtual' sprite.
Another 2 lists store the speed and direction of X and Y movement.
Sometimes sprites become frozen and need to be wiped-out, another 2 lists hold X and Y positions of posible frozen sprites.
The less there are, the faster they are redrawn.
Drag the slider and press the green flag button to change the number of sprites drawn. I dare you to try 100!!
Could add support for different costumes. Could add support for different effects. Could add support for different directions.
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coool!