Hardest Games???

Oh Game Daily...

http://www.gamedaily.com/articles/galleries/top-25-hardest-games-of-all-time/?page=1

I agreed with some of your choices like MDK2.

But I disagree with other choices like Doom. I remember Nightmare difficulty being fun and not one of the "hardest games of all time".

I was also able to beat Portal quite quickly. I think I only died a few times at the end.

Props for including the Metal Slug series in there.