I bought this for my 9 year old daughter who loves claw machines and vending machines. I considered this a bonus set because she can actually play with it after building without fear of breaking it. My daughter has only put together simple 3-in-1 sets before this so I was probably a little overzealous purchasing such an advanced set for her… BUT surprisingly she did 99% of this set by herself! The only part she had trouble with was the little gear part that holds the crank inside. It took her a week to build this so I was happy that she had a “project” she could work on that was a little more challenging. She surprised me and she was so happy with the final product! Such an intricate concept but the instructions were easy to follow. I loved watching her getting excited every time she finished another bag. I also loved that it came with 16 different minifigs and 16 balls to put them in. The only way to turn the knob is with a “coin” but don’t worry if you lose the coin you can always make new ones with a flat circle piece and a curved circle piece together!