A great set, very clear instructions, and great videos included. My daughter has never had so much fun. The sets require logical thinking and dexterity. Perfect for learning and playing for children, teenagers, and adults. Very high quality. We were pleasantly surprised by the fast and hassle-free delivery to Europe. My daughter now wants three boxes a month instead of one, and it's still not enough. I'm most happy that my daughter wants to become an engineer like her idol, Mark. She's now enjoying learning math, which was difficult before. Thanks to the crunchlab team.