My four-year-old grandson LOVED this set but was sometimes frustrated that some of the parts were hard to put together and take apart. And it wasn't just him I had to ask a strong man for help in taking a few of them apart. Younger kids should have a great time playing with it if an adult or older child is on hand to help.

my son had a blast with this toy although the instructions were very confusing and hard to follow. pieces were not easy to put together for him and i had to help quite a bit. taking them apart was even harder. i had to ask my husband for some strength. all in all good product but a bit frustrating at times

my grandsons LOVE this however the small pieces are difficult to put together and especially to take apart but i still bought another set for another grandson since he LOVES mine so much!

Grand kid loved it. Took to it right away. He loves gears. The only complaint I have is there were not enough of the six way axles to build the zig zag stairs pictured on the box. Other than that it is great!