Melinda's 2x2x2x2 - Introduction

This is the world's first physical 4D twisty puzzle. It implements the 4D analog of the 2x2x2 Rubik's cube. Specifically the {4,3,3} of length 2 as implemented in virtual form by Magic Cube 4D.

Canonical moves follow-up:    • Melinda's 2x2x2x2 - Canonical Moves  
Whole-puzzle reorientation:    • Melinda's 2x2x2x2 - First gyro  
How to scramble:    • Melinda's 2x2x2x2 - Scrambling  
How to get one: http://superliminal.com/cube/2x2x2x2/
Magic Cube 4D home: http://superliminal.com/cube/cube.htm
Correspondence with MagicCube4D:    • 2x2x2x2: Monoflip demo side-by-side with MC4D  
4D Cubing mailing list: https://groups.google.com/g/hypercubing/

00:00 Introduction
00:18 Anatomy
01:07 Legal moves
02:21 The solved state
03:17 Scrambling
04:07 Reassembly
06:06 How is it 4D?
09:54 The gyro move
10:51 Validity proof
13:08 History

Special thanks to Don Hatch, Roice Nelson, Andrey Astrelin, Oskar van Deventer, Joel Karlsson, Glenn Gordon, Matthew Sheerin, Matthew Cornelisse, Marc Ringuette, Nan Ma, and Bob Hearn.

Copyright (c) 2017, Melinda Green, Superliminal Software.