Want to get the kids involved with STEM, robotics, complex toys, things to stimulate young minds? Look at Quadrilla, its been around for years and you really wouldn’t think of as STEM and you’d be wrong! Quadrilla can be a very complex building system taking hours and even days to build. We have 3 sets joined together in the office, it might take little James or Emma a few hours to do, but it took me a few days to get right. You really need to think and plan, which way do I want the marbles to go, which block has the right holes, do I need a curved rail, a straight rail or a spiral, shall I add music?