Any Castlevania, especially the japanese version of Castlevania III (Akumajou Densetsu). Castlevania 2 is a lot weaker because it threw most Castlevania-esque things out the window, but it's still sort of ok I guess. Esper Dream 2, Darkwing Duck, Excitebike, Kirby's Adventure, Double Dragon III, Bionic Commando, Gargoyle's Quest 2, Ice Climber, Power Blade, Mighty Final Fight (awesome), Parodius da!, Radia Senki, Battletoads (just for the sheer gruesome difficulty that makes you cry blood), Batman - Return of the Joker (this is actually a very good Batman game), Super C (sequel to Contra for those who don't know), Earthbound (this should be self-explanatory I shouldn't have to say anything).