Shapeshifter 18 wood puzzle and brain teaser This listing is for the small 18 block version of the puzzle shown in the photo on the right Avail in 3 sizes, 18 block, 27 block, and 64 block Dexterity and creativity Puzzle stays in one piece and twists all about. This shorter model is designed for youngsters age 3 to 7 primarily, or adults who just want to "Fidget".