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!
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Dark Souls really isn't too hard once you get used to it, it's also fair, so my hardest game of all time goes to Castlevania 3, which was hard due to poor level design and shitty controls.