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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While not an entire game, it's Terraria's final boss. -SPOILERS AHEAD- Moon Lord. Expert Mode. Tons of health, tons of damage. The guy will absolutely destroy you if you stand still even with max defense. He's fast. He teleports. The ability to one shot you. It's a 200 damage bullet hell. But when you finally beat him... SATISFACTION.