For me you can't beat STALKER. I have tried pretty much every game out there but have found none that put me where this game does. I start playing and get lost in a world that can be both beautiful and terrifying. I remember my first visit to the Yantar lab in SHOC. It was in the early hours of the morning, I was using headphones while sneaking around the lab. The atmosphere had me on the edge of my seat. Ten seconds later something totally unexpected happened and put my heart in my mouth. I paused the game, shaking like a little child and from that moment on for me it has been the stick by which all games are measured. And sadly they just don't measure up. STALKER is a thousand games in one. Set in a constantly changing, evolving world. The only time any two playthroughs are the same is when you hit that ENTER THE ZONE button at the start of the game.
I'll change the screenshot when I load it up again.
This is a beta released by the Russians that brings 8 more areas to Call of Pripyat. I uploaded a machine/vanilla merge translation at GSC for it but as you can see by the crazy dialog it'll need a rewrite, I've only tried it out briefly so far, I hope it's worth doing the work needed as it is looking quite interesting. Map additions include the Garbage, Agroprom, Agroprom underground, Cordon, Military warehouses, Dark valley, Bar and the Wild territories