Thanks! I take your point that colours would help distinguish the different z-layers - it's pretty easy to confuse the two larger rings I found. I was also thin

Thanks! I take your point that colours would help distinguish the different z-layers - it's pretty easy to confuse the two larger rings I found. I was also thinking that making it stereoscopic might help. I've done this before where you have two running side by side, responding to the same controls, but you offset the z-axis a little. Then you basically match up the two by going cross-eyed! And voilà, more 3D information in the brain. Concerning the controls I had to factor in simplifying them to create the mobile version - https://nonzerosum.games/tetrings_mobile.html https://nonzerosum.games/tetrings_mobile.html because it was just not possible to distinguish between so many different gesture controls on a touch screen. So, in the mobile version, on a couple of axes you can only rotate in one direction, given this limitation I could definitely limit the keyboard controls for people with only 2 hands. Thanks again, finding comments like these has been really enjoyable.