Largest rotating puzzle cube solved by a robot

The largest puzzle Cube solved by a robot is a 9x9x9 cube tackled successfully by MultiCuber 999, an ARM-powered LEGO® robot built by David Gilday (UK) and demonstrated at the Big Bang Fair in the Birmingham NEC, West Midlands, UK, on 15 March 2014.

David Gilday built MultiCuber 999 from commercially LEGO® MINDSTORMS NXT kits and a Samsung Galaxy S3 smartphone powered by an Exynos 4 Quad application processor. The number of solution possibilities ran to 278 digits and the robot recorded a time of 34 minutes 25.89 seconds. A cube of this size is not currently part of any official Rubik’s Cube competition, but competitive guidelines were followed for the scrambling of the cube using the formula NxNx2 (where N=number of pieces along one edge), in this case 162 moves. The scramble was carried out by the UK speed cuber Joey Gouly, and GWR Editor-in-Chief Craig Glenday was present to the confirm that the cube was suitably scrambled.