I just played this in id1 because the Injector made me. It was quite hard at some points but good fun.

I've played this a few times before, and always felt it was a classic example of a map that's very hard at the start (especially with the lack of ammunition), and then comes out much easier towards the end. It's beautifully put together, though, no doubt about that.

I can't remember how to progress from the first big room, where the gold-key door is. Can someone please remind me?

Oh, silly me -- I found it. It's a shootable button recessed into the wall above the door that you entered by.

Finished it again. I was really torn over whether to score it 4 or 5, but in the end I went for 4 because (for me anyway) it's just that bit too hard on Hard. The main source of difficulty is lack of ammo, and that's not a kind of difficulty that I find very enjoyable. I guess next time I should play on medium.

It is superbly put together, though, no question. A couple more boxes of shells and it would have been a 5/5 map for me.

Easy 5 if it weren't for the lack of ammo. Want to make a challenging map in an old school FPS game? Make the health packs scarce, NOT the ammo.