So, I've been trying to remember this game for a long time now, sadly, there isn't much information I can give.
It's either a PS or PS2 Game and it could've been a demo version.
You know, like this CDs in magazines that had I don't know 7 or what demo versions of games.
Maybe around 1998-2006 (says not much tho since the game could've been released at a much earlier date), a Action/Adventure/Shooter/... not really sure what Genre/s exactly.
I do think the first level starts with you falling down into a subway, can't add more to that tho.
You had to collect keycards in order to enter through closed doors - like a lvl 4 keycard *- (who would've thought that) and to be honest that's all I can remember.
Oh one thing, there was something you had to do with a production line I think, like stopping it to be able to walk on it so you can get to the other side (that was blocked or just inaccessible, don't know).
The game reminds me of Syphon Filter, Metal Gear, Resident Evil ... for some reason, but I think I'm just mixing games together to fill missing gaps in my memory.
* That's also where I think I'm filling gaps with memories of other games, like the keycard probably comes from Metal Gear.
I know it's close to nothing, sorry.