Hands down this is the best gift my kid has had for his project gift. Every Christmas my kids get a project gift. This takes effort and is sturdy. It drives really well. It took him about 3 hours to assemble. I think my only complaint is that it doesn't explain more of the why it works they way it does. It is set up like lego directions so it is fairly easy to follow but is better suited for 8-12 year olds.
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