The pcs do not stay together, and for my son who wants to actually play with it and drive it around..doesnt really work. Hes every 1 minute wanting us to put it back together bc it doesnt stay. We have the race track also, and the Mario. I have found K'NEX as a whole doesnt really have the "click and lock" down too good, as some of the other building blocks do. Not too much of a fan of this collection. Probably wouldnt buy more of it in the future.
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