I bought this for the puzzle factor: I've enjoyed doing tangrams for quite some time, and there are a few twists to the play, such as the screen darkening so that one has to remember where one placed the pieces, or pieces being stolen. I've no complaints about the actual tangrams. However, as the levels increase, one has to 'earn' more puzzle pieces by playing a match 3 game. As of the low level 30's, it's gotten to the point where every two levels requires such a game. As this is not a type of game I am particularly skilled with, I am spending more time on the side games than the actual tangrams. This would not be a problem for someone who likes that sort of game, but as I do not, it has diminished my enjoyment to the point where I only give it two stars. This is very annoying, as I liked the actual tangram puzzles, and would have quite enjoyed the program if it hadn't had those particular side games.