What I've beaten pure. No game genie, no emulator save states, etc:
Blaster Master
Castlevania II
Day Dreamin Davey
Duck Tales
Duck Tales 2
Gremlins 2
Jackal
Jurassic Park
Kirby's Adventure
Krusty's Fun House
the Legend of Zelda
Maniac Mansion
Mega Man III
Ninja Gaiden
Ninja Gaiden II
Super Mario Brothers 1
Super Mario USA (Brothers 2)
Super Mario 2 (famicom disk system)
Super Mario Brothers 3
Teenage Mutant Ninja Turtles II
Teenage Mutant Ninja Turtles III
Games I beat by cheating:
Contra (konami code)
Guerrilla War (I used the infinate continues cheat)
Heavy Barrel (I think I cheated. I don't remember)
Ikari Warriors (abba is your friend)
Teenage Mutant Ninja Turtles with a Game Genie (I can get to Shredder in the Technodrome legit. But with one block of health. This game is an @$$h0l3.)