Version 2 of my non-euclidean level for America's Army. I only added one room in this version but the video is now HD.
This is a level I've been working on for the PC game America's Army using the supplied level editor (a modified version of UnrealEd). The first section of the level is a 720 degree circle. It's basically a long hallway curled up into a double-circle-type shape, with the ends connected. Sorta like if you take a rubber band and double it up, except the whole band/hallway takes up the same small area. The second area is the impossibly long hallway. At first glance it appears that it's just a small room with column in the center. Upon further examination, however, the "hallway" connecting the back of the room is many times longer than could ACTUALLY fit there. Imagine it as "squishing" a hundred feet of hallway into a one-foot space. The third area is the room in a closet. The closet only appears to be a couple feet deep and wide, however the room inside it is about a hundred feet both ways. Now step into the closet. The room you just walked out of is now contained neatly in the same small area the closet originally occupied. The fourth area is a long hallway with a small closet at each end. Walking into one closet causes you to walk out of the opposite one. Think of it as a little shortcut.
Try wrapping your head around these spaces!
(By the way, this was done with UnrealEd's Zone Portals and WarpZoneInfo nodes. The level is comprised of a bunch of unconnected rooms connected by zone portals. See the following link for more information.)