Umm, no multi touch?
Nice & simple, but keeps him captivated (23mo), but the lack of multi touch makes it very difficult for him to hold the phone and move items at the same time. (If one finger is touching the screen, another finger cannot provide input and move the shapes). Kinda old-style, but it is Houghton Mifflin after all
sheldonreiff about
Curious About Shapes and Colors