Snap circuits classic and snap circuits: bric structures. The kits are compatible with each other. A fun way for kids to learn engineering. Bric structures has everything included. The classic set is missing one piece. If you look in the manual, I checked off everything on the parts list, so it is obvious which part is missing. You can find replacement parts on eBay. Not all parts are necessary for every project. The box is also a little beat up. Offers are welcome. #stem #building #lego