motivating learning fun

My six year old loves the game and tries to the tasks that only material of the second class are actually solved. This is perhaps the only drawback. The first tasks are one class of materials and if they have been resolved, you may experience just graders to their limits. However, for second graders, the first tasks are pretty easy ...
Otherwise, the game is beautifully designed and motivating, because you can always rise one rank and my son every time wondering what he next is (pawn, knight, ....).