The fastest time to solve a Rubik’s Cube (3x3x3) by a robot is 3.253 seconds by CUBESTORMER 3, an ARM-powered LEGO robot built by Mike Dobson and David Gilday (both UK) and demonstrated at the Big Bang Fair in the Birmingham NEC, West Midlands, UK, on 15 March 2014.

Mike and David took 18 months to build and perfect CUBESTORMER 3. They used commercially available LEGO MINDSTORMS NXT kits and a Galaxy S4 smartphone powered by an Exynos 5 Octa application processor with an eight-core ARM big.LITTL implementation featuring four Cortex-A15 and four Cortex-A7 processors. As per competitive (human) Rubik’s Cube guidelines, the cube was scrambled prior to the attempt using a computer-generated random scramble sequence. The scrambling was carried out by the UK speed cuber Joey Gouly, and GWR Editor-in-Chief Craig Glenday was present to the confirm that the scrambled cube matched the computer-generated array.