I'm trying to unlock Protoman in Megaman 9. You can either enter a code or beat the whole game. I beat 3 of the Wily stages, then got to the Boss Rush this morning, then I had to shut it off to leave for work. This evening I fought Wily a couple times, but I have to restart because I need some E-tanks. He's in 3 different forms, and if you game over you have to do the Boss Rush all over again.
During the regular gameplay you just beat one boss, then it lets you save. It's totally old-school Megaman and you can't use a save state since there's no emulator. At least in Megaman 10 you can go to the shop during a Game Over. It's pretty brutal. I need a break.