This page contains a link to a Pac-Man-like game set inside a hypersphere, co-created by me and Isaac Dulin, a good friend and software engineer. A hypersphere, or 3-sphere to mathematicians, is a higher dimensional analogue of a sphere---whereas regular spheres exist naturally in our three-dimensional universe, a hypersphere is a shape that can only be properly represented in four-dimensions. Thus, our game can be thought of as something like three- or four-dimensional Pac-Man.
Before playing the main game, we recommend going through the tutorial to get more comfortable with the spherical geometry. Happy flying!