by enxio27 » Wed Dec 27, 2017 8:04 pm
For those of you coming to this thread five (or more) years later, the answer is Harakiri. Although all of the Harakiri I've seen are arranged vertically (2-1-2-1-2), I believe one could simply rotate a Harakiri puzzle 90 degrees to a horizontal arrangement (3-2-3) and obtain the same puzzle (same solution, merely rotated).