There is a game I played once that I am trying to track down, but I can't recall what it was called.
I'm hoping if I can describe it adequately someone might recognize it.
The game was a first person shooter. I believe I played it on a PC. It had a modern setting in an urban environment. (Or at least nearly modern; it wouldn't surprise me if it actually took place in the future, but it wasn't "space future on an alien world," you played in a modern-looking urban city.)
Visually the game looked rather old or low-poly, like it might have been built with the Quake 2 engine. I can't recall distinctly though, so I wouldn't exclude anything that looks like it could run on a PS2. But I'm pretty sure you could see things like street lamps and guard rails with distinct polygon edges instead looking relatively round. I'm quite sure this was before normal maps were used in games.
What I recall most distinctly about it was that it had a surprisingly high amount of audio clips. At least, compared to what I expected given it's visuals. I think there were two character models for the thugs you were fighting, which is kind of what you would expect for a game of that era, but I could play through the level twice and still hear new voice clips from them.
I think in the first level you were on the ground level, and then the second level you were on the tops of some skyscrapers.
I think the levels I played were pretty linear, but I also recall there was at least one point in the first level where you could take a different path by cutting through a building, although it connected back with the main path.
And finally, although I could be completely wrong about this, I have this vague feeling that the game was released for free, like the guys who made it decided to release it for free on its five or ten year anniversary. Mostly I think it was released for free because I can't quite imagine how else I was playing it, because I would have remembered if I payed money for it, and I just don't think it was a demo. But I could be wrong, so don't hold me to that.
I know this isn't much detail to go on, but I'm hoping it's enough to jog someone's memory. There can't have been too many shooters from that era that opened in a modern city.
(And no, it wasn't Sin. I am familiar with that game.)