There are games that make their mark most recently Half Life but SS2 steals its crown for me. For any FPS or adventure fan/real time strategy this is a cut above the rest. The plot is amazing and left me half way  through the game gasping (yes you know the bit). The progression of your  character with various traits is a steop above half life. It may not have  the shoot em up feel to it as HL but the thinking and realism is  compelling. It took me about a week to complete but this was solid every  evening  - it did take over my social time wondering what will happen next  - its THAT good. The Dark Engine is looking well but will probably look  dated soon and the atmosphere created is untrue. The ability to build on  certain strengths should be built into future games of thie genre. Its a  new thing which works brilliantly. You could go back and complete it using  a differnt trait and uncover skills you never before. The interface is cool  as is the sounds. I cannot fault this game, every gamer should own this -  If your reading this stop and buy it NOW. Looking Glass  - You've given us  an all time classic