to start with: I Wanna be the Guy!
if you haven't heard of IWBTG! (
http://kayin.pyoko.org/iwbtg/ ) it's quite possibly the hardest game known to mankind or at least to me (other than the impossible mario heck) and should take you atleast an hour to get past the first few screens. (unless you are totally hardcore or completely radical) One of the reasons I bring it up here is because there is a hilarious Zelda reference after the title screen.
NEXT UP: Syoban Action (Cat Mario)
ruthlessly hard mario clone that is in moonspeak (other than PRESS START) not that you need to read to play mario anyway
. trust me you will slap yourself till your nose bleeds when you get to the end of the first stage.
have any experience with those or any other impossible games?