If so, and you're over 14, UGEARS®, the mad mechanical model maker, invites you to assemble this 400-piece chain-hoist marble run kit. If (okay, when) you succeed, the result will measure approx 10-1/2” x 12” x 10-1/2”. Box says it will take you 7 hours, but you know how you are, so maybe adjust accordingly. At the end, you'll have a multiple track, 3-way switch, loop-the-loop, cascading machine and more. If you're really, really advanced, they say you could connect multiple kits in groups of (2) or (4) for extended marbleized fun. Free replacement parts from UGEARS®. Made in Ukraine, which makes for a nice change. ! WARNING: CHOKING HAZARD–Small Parts. Not for children under 3 yrs.