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My 8-year-old spent two whole afternoons assembling the walking robot, and the motor actually made it move across the kitchen floor. The instructions were clear enough that he only needed a little help with a couple of the gear connections. Definitely got him excited about how things work.

My nephew and I built the tabletop tornado and helicopter launcher in one rainy afternoon, and the tornado spinner really does make a cool vortex when you attach the motor right. The instructions were clear enough that he could follow along with minimal help, and everything held up through his enthu

The helicopter launcher has been the runaway favorite here—my son built it in one afternoon and we've been launching it in the backyard ever since. Instructions were clear enough for a 9-year-old to follow mostly on his own.