Some of the more difficult ones I finished recently...
Mike Tyson's Punch-Out
TMNT
Ninja Gaiden
StarTropics
Castlevania III
I replayed and finished Kid Icarus a year or two ago. It wasn't as difficult as I remembered. I also replayed and finished the original Castlevania(on GBA) about two or three years ago...I have no idea how I finished it as a kid. I also finally beat Mega Man(MM Collection on GC) a few years back, as I wasn't able to beat it as a toddler.
I beat NG2 as a kid, and will get around to attempting NG3 sometime in the future. Ghosts n Goblins is a soul-crushingly difficult game, as is Battletoads. I've also heard the same about NG3. I want to get Ghosts n Goblins and Battletoads so I can give them another go, but I have serious doubts about being able to do it.
"I feel like I could take on the whole Empire myself."
