S.T.A.L.K.E.R

[MetalMilitia]

I was several hours into the game before I got any good guns really. I got my sniper rifle from a bandit during the mission were you need to turn off the brain scorchers. You could probably find one before that though.

I either haven't noticed or experienced the night cycle yet, which is weird as I've played for a good 10+ hours.

The arena in a stalker outpost is cool too. You can make a load of money in there. It's a shame they don't pit you against monsters though.