What's the hardest game you've ever played?

A question about : What's the hardest game you've ever played?

My buddy has promised to buy me 10 drinks if I beat Warhammer 40k. Anyone done that? What are my chances?
What's the hardest game you've ever played.
For me it's probably the original XCom series or Myst.
I haven't started at Warhammer yet!

Best answers:

• Warhammer Dark Omen was one of the hardest games I have ever played.
• Revenge of Shinobi on the Sega Megadrive, I was only 5 or 6 at the time though...
• Warhammer 40K is a franchise rather than an individual game, there's quite a few Warhammer 40K games so it depends which one they are referring to and on what difficulty. I've finished the last few 40k games (Space Marine, Dawn of War, Dawn of War 2) although I've not tried Space Hulk yet.
  The toughest game of recent times which I managed to finish is Super Hexagon on line last setting, all you need to do is survive 60 seconds but it's very tough to do so.
  John
• Did anyone here own a ZX Spectrum? Before the days of automatic updates and patches you could be stuck on a level for days due to bugs.
  So my hardest game was some crappy Spectrum platform game.
• Killing Game show on the Amiga.
• Fritz on highest level and decent cpu. Doesn't get much harder than that. Houdini supposed to be near unbeatable too.
• Old school, Nethack or Adom. You will not finish these without reading up and cheating.
  Current(ish) games - Dark Souls. A real struggle and so worth it. Doesn't get the press of say Skyrim, but is a much better game. The atmosphere is perfect.
  If you haven't played Shadow Of The Colossus, please give it a try. Not super hard, but please, give it a go.
• I think the hardest game I ever played was Portal on hard. The puzzles are insane to try and figure out.
• Revenge of Shinobi for the Mega Drive, couldnt complete it.
• Kid Chameleon for the Mega-Drive. Only managed to complete it by using the 'cheat' shortcut to the final boss!
  With modern games, it would probably have to be Demon Souls and Dark Souls, although DS2 seems to be much easier.
• I think the game that frustrated me the most was Geometry Wars 2 and going for the Smile achievement.
  Because an attempt didn't take too long, I'd always find myself sitting there at 2am saying "just one more go".
  Got it eventually, but mut have been 6 month of trying!
  https://www.youtube.com/watch?v=93624POcNxI
• Smash TV and R Types were both solid games.
  I couldn't get very far in either of them without infinite lifes.
• The hardest game I have done is - The impossible game!
• Another solid game i'm working through just now is The Chaos engine.
  I used to play it on the Amiga 1200 back in the day, but it's recently been re-released on steam. Still as hard as ever.
• The campaign on Rome Total War II on hard, I'm on my fourth or fifth try! It takes weeks too, but at least you get your money's worth
• Monster Hunter on PSP 1,2 and 2 unite!