Summary: I bought it to play when I am on the bus and I am very satisfied about it. The difficulty level is there for me and I'm one step above beginner. Don't expect to beat the computer if you are a beginner or a casual player. As for the puzzles, mini games, lessons, we are talking about something very very basic; nothing compared to the PC version. I give a 4 stars for the chess main game itself and I subtract one star because of the extras which are no use for me.