A classical toy in new shape! Except being a good puzzle, this game gives you unique hands-on experience of four-dimensional space. You can touch a (virtually) real 4d object and rotate it's parts. The game is free (as in freedom), https://gitlab.com/evgen52/magiccube4dvr . If you have some problems with the game, feel free to ask here cubesupport1@proton.me .