If you own a copy of half life2 , you might like one of these official mods for the game, your choices are varied , from "Insurgency Mod"
modern combat type , to "Garys Mod" a nice time waster.
some like the insurgency mod have huge fanbases with tons of multiplayer servers , lots of game variety here.
http://www.halflife2.net/wiki/index.php/Category:HL2_Modifications <----------
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