(Matrix Revolutions, Portal, Cube 2: Hypercube)
Here are my examples...
- Some PoP1 (and possibly PoP2) mods, obviously.
- ZZT: Marked as white stripes between non-adjacent rooms on the maps. (long page!)
At other times, it's marked with a discretely placed pair of "A"-s.
(This game has a built-in level editor, and there among others, you can manually set room links.)
- The Legend of Zelda: Not marked on the maps... (long page!)
But their interactive map says "Go up 4 times" in room 12-07, where you couldn't do that if the links were regular.
And the same room has a path leading down.
(Hehe, Links... )
- In Scientific American, in the Mathematical Games section, there was a description about a Star Trek game.
(That the readers could make for themselves based on the article.)
There, if your spaceship leaves the screen in one direction, it appears on the other edge.
The article calls this "toroidal world".
Here is it in a table of contents: http://ftp.math.utah.edu/pub/tex/bib/toc/sciam1980.html#255(5):November:1986
(Why did they separate the section's name and the title of the "current episode"?)
I don't know whether the article is available for free. I've read it in the printed version, many years ago...
- Jim Button: In one episode the main characters enter a hallway, and if they try to leave it at either end, they appear at the other end.
I don't know the title of the episode.
Here is a list (in German), but I just can't find this episode...
The same episode also has a magical hourglass that can stop time (eh?), owned by a young Egyptian couple, and it's somehow responsible for the wrap-around.
- Iznogoud: In the episode "The Mysterious Poster Hanger".
The two main characters get trapped in a magical poster. When they try to escape down, they arrive at the top, and vice versa.
(This series has an Aladdin-like setting, by the way.)
- This Smurfs comic from this forum page.
- This fan-made comic from this (very long!) page -- Did he copy the Smurfs or what?
(Man, I hate how Photobucket redirects to a html page if I want to open an image on its own...)
- This fan-made Neopets comic. -- This time it's vertically, for variety.
So here is something more like it:
- This fan-made MLP: FiM comic on deviantArt.
The commenters call it "cheatmode", though...
- There are hypotheses about the shape of the universe that say it's finite and unbounded.
That is, if you traveled in the some direction for a long time, you could get back to where you started.
Okay, now this starts to look like a TV Tropes page...
(Actually, they have a page about a similar topic...)