'World's largest hand-solvable' Rubik's Cube weighs 680 kg
A 680-kilogram Rubik's Cube has been recently installed in the University of Michigan, United States, which is believed to be the world's largest hand-solvable, standing version of the puzzle. The cube was made using rollers and transfer bearings in order to obtain minimal friction. A team of students took about three years to construct it.