for me it would be mgs4, doing the 5hour run with no alert, no kill, no item on big boss hard was pretty hard but doing it on the boss extreme was impossible for me, i didn't have the solar gun and i died a lot of time from random bullets, so what is it for you?

edited: i presume hardcore means hardest

This.

Or this, on the hardest difficulty setting.

^^^Exactly what I was going to say.

There is only one correct response, and it is this. Too hardcore for most of you wimps.

Enemy Territory: Quake Wars, the most tactical-oriented shooter I ever played.

Nothing frustrates Casual Gamers like COD online.

I try to teach people to play and they just walk along and die immediately, and scream 'What the hell?'

Also maybe it's Fallout 3.

You need to be a real dork to get into that one.  (i love it)

trhe final bosss is insane, in that one

How come I knew you were going to post this? =P

The most hardcore game this gen is Killzone 2. It pretty much embodies everything hardcore gaming is about. Brown and Grey visuals, HD Graphics, Alien Shooting etc.

If hardcore = Hardest... then id have to say MGS4 on bigboss extreme

all time... id have to go with MGS2 on european extreme... i just couldnt do the tapping O part when solidus zapped me