Our son was 16 months when he got the Schraubklötze. The screw itself works not so good, but he still likes to play with it. Mostly it is a matter of luck when solving the two areas. With initially liked especially the beautiful workmanship and the colorful design. Unfortunately, our little whirlwind makes the pads often fall so that at the edges of almost all stones before the color coat is chipped and the wood is visible. I find that very unfortunate. Conclusion: toys, as such, very nice, processing well ...