It's a bleak, brutal game, playing like some strange hybrid of STALKER, Fallout and Left 4 Dead. There's no map until you actually find one. No prompts showing you the location of other survivors. All you hear is the wind and the birds. Because it's built on such a realistic engine, if you want to go somewhere, you have to walk. If you want to pick stuff up, you can only take what you can carry.
If that wasn't making things hard enough, the mod's developers have added extra survival elements, like the need to eat and drink water. Two things which you'll want to do, since you take the role of a persistent player; leave a game and, if you're still alive, you'll come back in the same spot with the same gear. Die, though, and that's it. The weapons and tins of beans you worked so hard to get are gone.