What's the hardest game you've played?

I Wanna Be The Guy.

Anyone who has played it (or even just youtubed it) can tell that there is no comparison. None.

Eh, that game is only hard the first time around because you have no idea what to expect. After you've experienced it all and know what to do, it's rather easy.

As for me, the hardest console game I've ever played (to perfection) was Perfect Dark. Close runner up would probably be one of the Contra games, or Gunstar Heroes.