This is actually a topic I've been meaning to do for awhile, since there are a lot of FPS fans on here that I know would enjoy some of the games on this list, and most of them can still be played today and hold up to the tests of time.
The list focuses on creative aspects on a lot of the games, and I don't individually rank games in a series, unless I specifically feel one game is above the rest in the series.
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Fresh from my first justified ban. Ever!