During the course of making the film, she never fulfilled her intended goal of learning how to speed cube herself. “I haven’t set aside the time to memorize those algorithms,” Kim says.

A deep reinforcement learning algorithm can solve the Rubik's Cube puzzle in a fraction of a second. The work is a step toward making AI systems that can think, reason, plan and make decisions.

Speed cubing turns the iconic fidget toy into a competitive challenge. We tested 14 cutting-edge cubes to find the best options for all skill levels.