apparently it is a mathematical game
try this:
take number 50:
50 = 5+0 = 5 -> 50-5= 45
what if we choose 51?
51 = 5+1 = 6 -> 50-6= 45
ok say this $ is representing 45 whatever the math operation (add, substract with its original number)as long the result is 45 the symbol is always comes as $
ok, not only 45 is representing the symbol $ as well other result of mathematic operations will be shown the symbol $.
take this number: 98
98 = 9+8 = 17 -> 98-17 = 81
ok to trick your brain the result is 81, and you will look at the number 81 is represents with $, so whatever number you pick you add two combination number, substract it with original number will be represent by symbol $.
so the programmer put as many as result of math operation you can think about with the same symbol: $
ok if you got amazed what crystal ball showing you what is the symbol thats in your mind, then you click try again, again! the computer shuffles the symbol but the same symbol will be the same on each number whenever you think about the result, then again you click you will get amazed..dont be fool by this its a math operation logic whatever it brings you, it will be showing the same symbol, its just playing with you brain to think that this crystal ball can read your mind lol.
I admit this is a brilliant work of programming and flash, I salute the creativity of the programmer. :D