La-Mulana
I beat La-Mulana, and then I did the bonus dungeon, the Hell Temple. If I ever play the game again, it will be too soon. Also blindly stumbling around for 2/3rds of the game, then resorting to help for increasingly cryptic puzzles got me almost but not quite to the achievement for speed running it. So close, yet, so far.
It's not that La-Mulana ever got Hard like Super Meat Boy, just frustrating, because unlike SMB, you couldn't just restart 30 seconds back in time at the start of the stage, you had to go through multiple screens of platforming. And the puzzles... some of them were easy, but others were just so much cryptic crap that it hurt my head.
So 10/10 for the frustration factor, only 8/10 for actual difficulty that wasn't due to crazy game design.
It's not that La-Mulana ever got Hard like Super Meat Boy, just frustrating, because unlike SMB, you couldn't just restart 30 seconds back in time at the start of the stage, you had to go through multiple screens of platforming. And the puzzles... some of them were easy, but others were just so much cryptic crap that it hurt my head.
So 10/10 for the frustration factor, only 8/10 for actual difficulty that wasn't due to crazy game design.