Best Math Construction Toy Ever : http://www.amazon.com/s/?_encoding=UTF8&camp=1789&creative=390957&field-keywords=klikko&linkCode=ur2&tag=dmmgfk-20&url=search-alias%3Daps If you are baffled, looking for a unique gift, boy or girl, 6-13, educational but fun, budget $25-$40, try Klikko. With Klikko, kids can explore the world of regular polyhedra without staying glued to a screen or messing with glue and cardboard. I bought one for myself many years ago. Unfortunately, I like it too much to let the kids play freely!!!! Maybe I need another set for them?