As other reviewers have said it takes a lot of effort to get the car through all the loops on this thing but if you hit it too hard then it will the caterpillar simply flies off track or moves. The chain also flexes a lot, making it easier for heavier machines to fall out of the loops when the chain flexes more under weight. Also, it's not exactly something a child can easily assemble unaided - that's not necessarily a negative point - more of a warning. If you want your 6-year-old to just open the box, play and leave you alone, that probably won't happen until you set this thing up for him. for some time. I love that it's a good resource for scientific discussions with my kids about gravity, weight, and various laws of physics. You can also come up with some "hypotheses" with each car based on shape, weight, etc., as well as how hard you need to press the launcher for each.
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