I gave this set to my four-year-old son and he loves it, as do his daddy and I. The only problem is that he made something that took almost all the pieces and he likes it so much he won't take it apart! Now we have to get another set for his birthday so the grown-ups can play, too. If you get these (and I highly recommend them), get a lot; everyone will want them, especially if you have a house full of builders and geometers like we do.