if you can IMAGINE it, you can BUILD it with K’NEX! K’NEX is a rod and connector building system that lets you build BIG and make it MOVE!   At Duffy’s Toyworld, we’re excited to bring you a fantastic selection of K’NEX sets, perfect for budding engineers and creative builders of all ages. Whether it’s towers, roller coasters, vehicles, or robotic creatures, K’NEX offers endless possibilities with its unique interlocking system.