I have to say this Half-life 2 mod is excelent, several players play as a team of I.R.I.S members that have been deployed to capture a genetics experiment gone wrong called subject 617, which is played by 1 live player, its esencially an all v 1 situation but with a twist as the person playing 617 is virtually invisible when standing still and you can only see a few fluctuations when he moves, which gives hime a big advantage, but the only weapons he has are a knife and a couple of pipe bombs. It is a very well made mod and the game play is great in my opinion, with several new weapons and weapon mods, its a welcome change from cs:s and possibly a big rival.Check it out http://www.hidden-source.com/