[squeaky-clean]

I remember playing a flash or java game years ago that did exactly this. It was a 4d maze, rendered in stereoscopic 3d. It displayed the images side by side and you crossed your eyes to get the 3d effect.

It was really disorienting (the 4d, but also the eye-crossing), and like the post author says, just bundles of lines rather than solid shapes. Still very cool.

Ooh, I found it!

http://www.urticator.net/maze/

[fao_]

Thank you so much! I've wanted something like this for ages. Now to figure out how to cross my eyes consistently with astigmatisms...

[wruza]

Idk where I found these. Not 3d though, just stereoscopic 2d. Tetris may be nice for stereo-training, as it doesn't involve any complex movements. But it was harder to me than seeing stills.

http://www.hidden-3d.com/games_stereogram_tetris.php

http://www.hidden-3d.com/stereogram_games.php