Look at the 9 , it changes everytime with all the numbers on the same diagonal "from 9 to 90" if u subtracted any numbers from each other , the results will be one of the numbers on the 9 to 90 line Symbol
good game , but there is something weird .. the level Warwolf .. when u point at that level with ur mouse when its low-lighted (( not completed )) a pyrmaid shows in the backgroud of the card / but nice game 10/10 :D