Where the Rubik's Cube is solved by twisting blocky columns in intricate patterns and sequences, the Magic Cube design is a much ... that's reckoned good for up to 2.5 hours per charge.

By now, all the Platonic solids have been transformed into twisty puzzle variants. And riffing on the original, there’s the 4-by-4-by-4 Rubik’s Revenge, the 5-by-5-by-5 Professor’s Cube and ...