Professor Pyraminx Rotational Style Brain Teaser Puzzle Pyraminx is a Rotational (think Rubik's Cube) Style twist and turn Puzzle. 4 Colors, 4 sides including bottom. Easy to scramble-up colors. Object is to bring puzzle back to a single color on each side. Smooth internal gear operation. Turn any of the four edges of the pyramid. Double click small photos for much bigger views of this puzzle. Recommended for ages 12 to adult. NO force ever required.