the grand daddy of all hard games has got to be bart vs the space mutants. i lost count of how many controllers got broken thanks to that game. it still gives me nightmares
I still can't believe how Bimmy got by without being corrected to Billy.
I have Bart vs the Space Mutants. My favorite stage was the carnival. I would just get coins and win 1ups. I hated the museum stage though. There was a time when I couldn't pass it (damn tar pit jump to a lil bone).