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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I would also say mgs2 on European extreme mode at the boss battle where you have to take down 26 metal gear rays and only one missile kills you. So fuucking tedious and time consuming.