Doom for being the scariest piece of

I ever played.
Half Life for making the FPS games what they are... most of the GUI and standards now for FPSes came from this game.
And lastly, Halo for actually being the friggin best FPS ever. Having ALL the weapons with melee attacks (you cant do that with other games), gernades, vechs, funass multiplayer, splitscreen & campaign, and having a system where health points is no longer existant... instead having sheilds that recharge (if you ever played and FPSes online, dont you hate it when you kill one guy, you run around for a heath pack but some guy comes out thinking he pwns you and takes advantage of your low HP).
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i agree with you fully, i think Half-Life was the turnning point in games and first person shooters, then half-life2 changed my life(not really but still, your missing the point)everytime i go to work, on my break i play halflife 2, call my g/f, or eat lunch or w/e but yea yoshi half-life for making the first person shooters what they are today