Extremely fun (and frustrating at times in a couple areas) to assemble. Be cautious when assembling some of the little parts cause they will break somewhat easily. There are extra pieces of the really easy to break parts. It seems flimsy when initially assembling but once together is a solid little fun bit of puzzle building. End result isn't extremely smooth running (the wooden bits) bit the music box sound is smooth even if the wooden moving parts are a little jerky. Have ordered another one (one of the other models)
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