nes: track & field 1-2, duck tales, rescue rangers, bionic commando, double dragon 2 ............ I'm suprised nobody mentioned ......kung fu, and contra..... do not read if you do not remember the code for 30 lives
Snes: blackthorne, wwf royal rumble, zombies ate my neighbors
Sega: golden axe 2 ... streets of rage 2,
Playstation: parappa the rapper
n64: rayman 2, wrestlemania 2000