I haven't found a challenge in games for years I beat everything on the hardest difficulty with easy so the story and exploration are what I crave.
Come play some Stalker. We lose a lot of people to rage quits on the first mission. The Russian/Ukrainian mod Narodnaya Solyanka is ridiculously hard. I am having a lot of fun with it.
I play Fallout NV on hardcoe very hard and do very well ... drunk. I cannot play Stalker drunk, not and do well at all.