My 13 month old daughter loves these. Once she got the hang of putting them together, she was really pleased with herself that they rewarded her with a little tune and some silly noises. Obviously, she is too young yet to understand the relevance of the noises, so does not grasp the importance of putting the right halves together, but this seems irrelevant to her at the moment. My 4 year old finds it more ammusing to mix-match though and see what strange noises he can make. Overall a good toy, but dexterity needs to be quite developed as might be difficult to fit together for some children.