Let's see... Read, write, program very basic stuff, memorize useless things (like songs, for example- I've memorized most of the Les Miserables musical, most of Wicked, a substantial portion of the Phoenix Wright musical, not to mention every line of dialogue from adamwestslapdog's Legend of Zelda abridged), and other things of that sort of nature (I'm not an athletic type. At all.) What do you like to do?
The original NES Castlevania is PAINFUL. I'm playing Super Castlevania IV now on Virtual Console, but it controls horribly due to my using a GameCube controller because of the lack of a Classic Controller. Even despite that, however, it's still great. Mega Man is awesome, though I haven't played much- only Mega Man 2, one of the X games for GBC but not sure which, and Mega Man Zero 2. And Mega Man 9 for the small amount of time it took me to ragequit. I want to play more, though- I like the Zero series the best.
Have you ever played I Wanna Be The Guy? If you like Mega Man, you'd probably enjoy the simply ridiculous difficulty level of IWBTG. You have 1 HP. That is all you get. Ever. And it takes heavy inspiration from Mega Man- Dr. Wily appears as a boss, as does Devil Dragon from MM2, and there are two whole areas based on Mega Man. They even include that disappearing-reappearing block thing that the Mega Man games are so fond of. Not only that, but there's a Castlevania II themed area, complete with Dracula as a boss. It's an 8-bit gamer's dream come true. Oh, and Link kills you at one part. That is all. XD