Super Mario Bros
Super Mario Bros 2
Super Mario Bros 3
Legend of Zelda
Mega Man
Mega Man 2
Mega Man 3
Mega Man 4
Mega Man 5
Mega Man 6
Isolated Warrior
Double Dragon
Double Dragon II
Double Dragon III
TMNT II
TMNT III
Castlevania
Blaster Master
Final Fantasy
Dragon Warrior
Guerilla War
Jackal
Contra
Super C
Bad Dudes
Batman
Godzilla - Monster of Monsters
Karate Kid
Kung Fu
Mickey Mousecapade
Mike Tyson's Punchout!!
Startropics
Goonies II
POW Prisoner of War
34. That's on actual hardware. Then there's the game that technically don't have an end even though you finish all of the levels, like Donkey Kong, DK Jr and Skate or Die.