This Time Tested Toy Needs No Screen The wood marble run has been around for centuries. It’s a timeless marbles puzzle that’s just as fun today as it was back in 2500 BC Here’s something ageless with a new, fresh twist (and lots of turns!) Introducing - SmartsToy’s Battery and Solar Powered Marble Roller Coaster Building Kit. Where Fun Meets Education Helps with Child Development STEM kits can do so much! This wood mechanical puzzle can help kids build up their cognitive and motor skills, understand teamwork and goal setting while keeping them occupied for hours while having fun! Not just fun for the Little Ones Not a kid or a teen? Building puzzles for adults is a favorite pastime for millions! Build your own marble coaster and enjoy the deep focus and sense of accomplishment that comes with it. You can also use it as home decor Made with Laser Cut Precision Not all wooden mechanical model kits are made equal. Our mechanical models are made with attention to fine details. F