Our 4 year old son was able to learn all the letters of the alphabet, including punctuations, numbers, (working on symbols) in 4 months time. Folks are amazed hes typing out actual words on the keyboard instead of gibberish. Hes also taken a liking to learning the actual meanings of the words hes typing out. He knows all the stages by rote (for example, he will say he learned how to type the 9 in the Throne Room, and would ask about the whole Knights and Castles theme of whole program. Clearly, much effort was put into the interface and structure to make it interesting and challenging for kids.