Solving Rubik’s Cubes is a learnable skill. However, to compete at the top level, you’ll have to train hard. Speed cubers can solve a 3×3 cube in under ten seconds these days, after all.

The ex-Mars AI Robot Cube is a self-scrambling electronic cube that's great for novices and experienced cubers.

When the electronic timer flashed 7.55 seconds on the screen at the Nanjing Rubik's Cube Sports Center, 23-year-old Liu Junqian triggered a flurry of excitement among athletics enthusiasts. Having ...