So much more than a stacker - this toy is a sorter, jigsaw puzzle and manipulate puzzle all in one! Start by joining the puzzle bases together, and then twist the shapes to get them onto the appropriate post, while sorting by shape and color group. Colors are are in graduated shades. Children can make up their own ways to play with this versatile developmental toy. 7.7 x 7.7 x 3.8 inches. 18 months and up.