Professor Cube, WikiCube

The Professor Cube is a 5x5x5 Rubik's Cube variant. It has many similarities to the Rubik's Revenge, but is fundamentally different due to having odd-numbered dimensions. Like the standard Rubik's Cube, the centers maintain their location no matter how you turn it. Early versions of the 5×5×5 cube sold at Barnes & Noble were marketed under the name "Professor's Cube" but currently, Barnes and Noble sells cubes that are simply called "5×5." Mefferts.com offers a limited edition version of the 5×5

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