I tried the game with my kid and there's a serious problem of level. The puzzles seem to be done for different ages. When my son (4 y.o.) plays the game, he is quickly stopped by an addition or a subtraction for example. On the other hand, a kid able to do a substraction is too old for a puzzle where you have to recognize the shorter or the taller object, or associate colors. Which age did you have in mind for your game? Maybe I missed a setting somewhere.