Play a stereoscopic 4d game around the hypercube (a.k.a. tesseract).
Mathematics and computers can be used to model 4d space just as well as ordinary 3d space. Your brains may be less flexible though...
Hint: play the game in 3d mode as if it was a 2d game. Then play the 4d game as if that was a 3d version of it.
After a while you'll move around in hyperspace like you've never known anything else ;-)