I used to play a lot of Blaster Master, Contra, Elevator Action, and Spy Hunter, all on NES. Every now and then, I'll play them on my PC with an NES emulator.
I was a die-hard Contra addict. I also made Castlevania, Ninja Gaiden I & II, Metroid, Jaws, Karate Kid II, Mike Tyson's Punch-Out! (original muthafuckas) Double Dragon, and Rygar my bitches. However, Renegade, Zelda 1, 1943, Ghosts & Goblins, Trojan, Wizards & Warriors and Wrath of the Black Manta kicked my ass.