Once the track is fully customized to the design that comes with the kits you buy through GraviTrax, it's really a lot of fun. However, this is difficult for children to set up because the instructions, although quite detailed, are not clear. Also, I've tried (as an adult) to build a few tracks from scratch, and while I managed after a lot of effort, I don't think kids will be able to create their own concepts. However, we really like it and recommend it to anyone willing to invest time in creating tracks.
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