However - I believe ShelLuser was speaking figuratively in this instance.

Well, if we're going for the broader definition of modern the mother of them all was
Catacombs: The Abyss. - Predates Escape From Castle Wolfenstein by over 2 years.
I defined modern as true open world.

- I was going to list Call of Duty and Medal of Honor but omitted them because they're
not actual 'open world' games.

'All' modern FPS games is certainly an exaggeration. It was highly influential, however. I think Wolfenstein 3D, Doom, Quake, Unreal (solely due to its engine), Half-Life, Counter-Strike, Deus Ex, Halo: Combat Evolved, The Elder Scrolls III: Morrowind (despite not being a shooter), Halo 2 and Call of Duty 4 were more influential. Far Cry 2 is up there, though, which is saying something for a game very many people haven't played.

@ ShelLuser - Definitely an all time great. - I would also have to list a few others that
helped to birth modern open world FPSs. - The Unreal Engine predates this by about
10 years. ; )

@ Saliengo - Love the game but have my hands full right now. Thanks for the lead 8 )

FC2Crew
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The true mother of all modern FPS games!