It's an extremely simple game. There is literally only one screen in the game, the music board.
Each of the three groups of colors represent a group of similar instrument sounds. The red squares are different percussion instruments. The yellow squares are different notes on a lower octave of piano. The blue squares are a higher octave on piano. This was one of the first games that actually engaged John on the iPad because even as a 1 year old, he quickly understood that the more he mashed the screen, the more sound it made. There's even a cool particle effect that explodes when you tap a box.
I would have loved some enhancements, or alternate modes on this game to continue its usefulness for a toddler. I think a mode, kind of like the game Simon, where the game shows a sequence of notes, and then the player must mimic it would be a useful way to start getting kids to learn how to memorize music. On the other hand, there is definitely an elegance in Baby's Musical Hands' simplicity.
At this point at 2 years old, John is outgrowing Baby's Musical Hands, but I know he'll enjoy showing his new baby brother James how to play! If you have a one year old who's excited to try Mommy and Daddy's iPad, this is a great game for them to try.