Which was your hardest-challenging fps??

Left 4 dead on expert, payday on overkill also insane

mine is warz, it's really challenging even to start the game

F.E.A.R on the hardest is pretty hard, really well done AI.

Far Cry 2.

Counter Strike Source

Spec Ops mode on Veteran in COD: MW 2.

First Resident Evil....that game I think its one of the hardest ever made.

Crysis 2, the multiplayer is too difficult for me, one of the reasons i didn't bought Crysis 3.

STALKER AMK mod on Master... really amazing experience.
Can't wait to start MISERY mod for Call of Pripyat

Microsoft Paint

Halo: Wars

halomans

Counter strike ppl seem to always be better than you

Counter-Strike

Arma on HARD mode

BLACK OPS 2 ERMAGHERD HARD GAM!!1

Doom II, I'm still unable to finish it.

Beaver Hunter 2006

Action Quake 2, really hard game to get into.

Stalker: Shadow of Chernobyl.

It will mess you up.

CoD4:MW on veteran. dat last mission... took me hours to make it though the whole plane in 60 seconds

Shadow Harvest Phantom Ops; how can anyone stand to play much less beat the game?

Any of the classic great ones before every game wanted to be halo basically.

assuming hardest difficulty most of the serious sam games, painkiller, you get the idea.

try not getting aimbotted or shot through a wall in warz... next to impossible

IGI 1 or whatever that was. And Opeartion Flashpoint.