People who say Dark Souls is the hardest game ever don't know true pain. This game would be damn near unplayable without the Legacy Collection's 'rewind' feature honestly.

The very first Mega Man game and it features some ridiculously tedious platforming and insanely slippery controls. Pretty awful stage design that has some serious artificial difficulty as well, but there are still a lot of good ideas spread throughout and it has the core mechanics of the series, the game is just very unbalanced and not polished enough to utilize those mechanics properly. Certainly a rough beginning for such an iconic franchise, but at least the music is still sick and the boss fights are charming.