18 months & up. Discover the mystery behind each of these transparent, candy-colored STEM Curiosity Cubes. Each cube can be twisted, shaken, and flipped upside down to get the beads inside to slide and gather in one spot. It takes a different level of skill to solve each one. Included: 4 Different, bead-filled Curiosity Cubes in yellow, red, blue, and green. Cubes measure 3" x 3" x 3".