the hardest game I've played is the original Mario!
ready...
set?...
GOOOO!
Edit 1: Thanks for all the replies guys! 300+ and counting I love it!
Edit 2: 500+ hole cow thanks guys! keep posting!
Edit 3: .........1000+........COMMENTS
WHOOHOO!!!
Edit 4 I hear 2000 calling my name!
-
Probably Dark Souls 1. Dark Souls 2 was difficult in its own way, but I was able to figure it all out pretty well, and now I can run through it pretty quickly. (Not like a speed run, those guys are crazy)