Hardest game you have played?

Nobody says "The Neverhood" ,really? :)

Oddworld: Abes Oddyssey

Mr. Bones for Sega Saturn

Far Cry 1, Super Meat Boy, BattleToads on NES

Super hexagon and Gundemonium Collection on Steam

QWOP

Electronic Super Joy, Binding of Isaac & Super Hexagon.

Dungeon Crawl Stone Soup

I wanna be the Guy and They Bleed Pixels.

Super Meat Boy

Don't see Stealth Bastard anywhere. Or N+ for that matter.

Cpt. Klos on Atari XE. I played it like 1000 times and at one particular moment I couldn't move forward :(

ninja gaiden

Dragon Age: Origins is really hard to me, but to other people I'm sure it can be considered easy.

I uninstalled They Bleed Pixels while yelling obscenities at my computer. Does that count?

mine are darksoul and xcom

Immortal for the NES.

Eve online - dont believe me? here is the learning curve

I Wanna Be The Boshy

dark souls ( anor lando part)

Fighting games like Street Fighter and Tekken. At least to me, the gameplay seems to require lightning quick reflexes and impeccable timing.
I can beat the easy AI by spamming attacks semi-intelligently, but shoot. Combos, cancels, and actual technique confuse the heck out of me.

Super Meat Boy

Circus Charlie

The Stanley Parable.

You do not play that game, it plays you.