This game is great, I couldn't stop playing it when I first bought it. I still can't believe it runs well on my video card the only meets the minimal spec (DirectX 7 level graphics card). I managed to play it on medium/high settings, although some of the graphical effects were missing (water is a solid, transparent color, no bump maps, no detail props) but that didn't make the game that bad. Now, I'm preoccupied with the deathmatch mode that was just released. Currently, there are only two maps but it's still great.
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HL2 Deathmatch