Click on cue ball (white ball for those who are not practical with this game) or pink ball and move them wherever you want to see the shadow within which you are in a SNOOKER. Dotted lines and dotted balls (named ghost balls) indicate the shadow area considered to determine a FREE BALL. A free ball is appointed when a player commits a FAULT and leaves the opponent in a SNOOKER, considering in this case the area between dotted lines. You can move all the other balls even though them haven't any function. On the right you can read the distance between the centres of the balls (upper label) and the shortest distance between them (lower label) Everything is reproduced in scale (cm) If you wanna zoom in and out just click shift and use scroll wheel. To return to original layout click on refresh button on the top right corner. I hope you enjoy!