Apart from the twist the map is pretty okayish.

I agree more or less with the sentiments expressed in the other two comments. The illusion itself deserves praise for being original and well executed, but the rest is fairly bland and not really enjoyable. An over-abundance of pitch black areas makes gameplay hard for the wrong reasons.

What a disappointment. I assumed you'd get to walk on both planes of the walkways at right-angles. Nope -- it's just scenery. I gave this 2/5. but 1/5 would not have been unfair. Full-dark is never a good way to make problems.

MikeTaylor, not sure if I'm interpreting your comment correctly, but actually tilting the entire map or shifting the gravity sideways would (as far as I know) not be technically possible for a 1997 Quake map. I don't think you can do that even today – or ever, given the inherent limitations of Quake (those in the know, correct me if I'm wrong).

But -- SPOILER ahoy! -- the map DOES effectively let you experience walking on both planes at right angles. Once you pass through the teleporter you are taken to an exact reconstruction of the scene, with everything tilted 90 degrees. So whereas it is perhaps "just scenery" at fixed points in time, consecutively it does create a convincing illusion.

I'm not calling your rating into question, but your comment made me wonder if you had perhaps missed this while moving through the map, in which case you might find it worth another look. The illusion alone really is done very well.

That's weird, the illusion as you describe it is exactly how I assume it would be done, yet I somehow didn't see it. I guess I'll have to play through again. How could I miss it?

[... ten minutes later ...]

Oh yes, of course. Wow, how did I miss it? I didn't notice it the FIRST time round, having come up the long elevator.

OK, well I guess I'll stick with my 2/5 rating; but at least now it's a solid two instead of a should-have-been-one-but-I-took-pity two.