.. or Magic Cube, as they call it.
Magic Cube 4D
It's just like a 4D-Rubik's Cube (or tesseract), at least in theory.
Make sure to read the short instructions below it. It's tough; so far I can only beat it when it's scrambled by one..
For some explanations on the 4th-dimension,
this site has some really nice picture-laden (and short) reads. That site also has a 4D maze game, but I couldn't get it to work! I wish I could, it sounds sweet.