You may have already seen the LEGO MultiCuber robots solving physical cubes from 2x2x2 thru 7x7x7.
However, the algorithm developed for this series of robots was designed to be able solve arbitrary size cube limited only by memory and time.
The algorithm generates solutions consisting of...
http://cube20.org/
We all know that God's number for a 3x3x3 Rubik's cube is 20 moves. But I have been wondering lately what is God's number for a 4x4x4 Rubik's cube? :confused: