I love the PS1, but I don't know much about it's first person shooter games. I only know about Medal of Honor/Underground, MDK, Resident Evil Survivor, and Powerslave/Exhumed.

What other titles would you recommend?

Come to think of it, I'm not sure if I ever played any.

There were a few weapons in Metal Gear Solid that had you enter a first person perspective. Which I think is the closest to FPS I got on the system.

Oh yeah actually, I did play Time Crisis on it. Which was very fun at the time.
But with a GunCon.

Don't think I'd recommend the game without a gun controller of some sort.

Not many come to mind lol. Ironically I think more of the N64 when it comes to FPS games but Star Wars Dark Forces and Quake II are the first to come to mind.

EDIT: OMG I can’t believe I forgot this! Medal of Honor!!!

PC definitely dominated the FPS genre back then with the best games in the genre, mostly propelled by superior graphics technology.

Nintendo 64 had a few standouts with Turok, Goldeneye and Perfect Dark...

But the PS1 did get Quake, Doom, Duke Nukem, Alien Trilogy, Descent, Delta Force to name a few.

Alien Trilogy is on my list for some time. Maybe I'll try it soon.

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Thanks everyone, I'm reading all suggestions.