After seeing a video somewhere where a guy got outside the fence on the Pit, I decided to try and replicate his act. He did it using teleports, and he said it took him forever to get a teleport to stay outside the fence - typically, when you place a teleport past an invisible wall, it disappears after a few seconds.
I couldn't ever get my teleport to stay, and then I realized I'm an idiot. It doesn't have to stay, in order to go through it. You can travel through it while
you're still holding it (I knew this already, but hadn't been considering it in this situation). So I placed a teleport on my side of the fence and then held another on the outside. And then I went through the one on my side and came out through the one I'd been holding on the other (it's confusing, I know).
Anyway, using this teleport hopping technique, I got to some cool places:
To recap, you place a teleport inside the normal area of the level, somewhere close to your target area. Then, you create and hold another teleport, and (sometimes it takes some work) get it so that you're holding it
in your target area. Without causing the second teleport to leave the target area (you're still holding it), you move through the teleport in the
normal area of the level, and you come out in your target area.
Sometimes, you have to use crates to be able to place the normal-area teleport close enough so that you can enter it while still holding the second teleport in the target area (i.e., you want to get to a really high place, but you can't hold the second teleport there while still reaching the first teleport - so you stack crates really high and place the normal-area teleport on top of those crates).
There are boundaries, of course:
My goal was to get to the catwalks above the level, but it turns out that outside the level there are secondary invisible walls that prevent passage, as well as...
zones, I guess you could call them. Outside of the level there are three types of zones - (1) normal zones, that you can walk around in, (2) 3- or 4-second kill zones that kill you after a short period of time, and lastly, (3) insta-kill zones, that I could only reach by teleport, but I died before even being able to move. Determining which area is which is tricky, but one sure way to check for insta-kill zones is by trying to place a teleport in that area - if it disappears
instantly, then it's an insta-kill zone, and you it's very unlikely that you'd be able to use teleports to get there.
The catwalks above were an insta-kill zone, and I wasn't able to get there.
And, of course, none of this is useful in an actual game, but it's still fun to push the boundaries and try to get to places you're not supposed to be able to get to.
I've only tried this on the Pit and Zanzibar (and had no progress on the latter), so I'd be interested to see where folks could get using this technique on other levels.