I just made a series of videos on how to solve Melinda Green's 3-dimensional representation of the 4-dimensional 2x2x2x2. Check it out if you're interested!
https://www.youtube.com/playlist?list=PLRiNDmMy00ODLOOnpT5aybqZm7Art-y3U
https://www.youtube.com/playlist?list=PLRiNDmMy00ODLOOnpT5aybqZm7Art-y3U