Made in collaboration with German puzzle designer Uwe Meffert, this new and challenging take on the classic Rubik's Cube will have you stumped and addicted for hours and hours. The 3D Gear Cube ups the difficulty stakes by adding 3D elements to the standard puzzle cube. Now each face and gear can be rotated and moved in all manner of directions, making it a much more diverse challenge to match all the colors on one face.