Summary: I bought this game for my 7 year old and she mastered the entire game in less than a month. As others mentioned, you can unlock as you complete your practice (they call it career). However, there aren't many things to unlock. A bright second grader can play this game for about 2 weeks and that's about it. It is lacking in depth to challenge 3rd and 4th graders. It was available for 20 bucks on Amazon when it was released.
Summary: Please see the other reviewer's detailed comments. I completely agree with all those comments. I got this game for 5 year old, and he is loving it. It is easy enough, and at the same time it has some new things to learn. So that way it keeps it interesting for my 5 year old. My 3 year old also can use it and play the games like Color match, but needs some prompting rom behind to mix the right primary colors to get the secondary colors. All in all - strongly recommend.
Summary: We bought this for my six year old son, who loves science. The games are really neat and will only open harder lessons once the first ones are mastered. There are five categories including colors and sounds, physics, biology, human body, and geography. We have only been able to open the colors and sounds section and the physics so far. The colors and sound section has a really neat paint activity to combine colors to match a certain given color.