What cheat codes have remained in your memory to this day?

[d21lewis]

slab_of_bacon said:

Up Up Down Down Left Right Left Right B A Select Start - Contra

007-373-5963 - Mike Tyson's Punchout

A B A C A B B - Mortal Kombat

Down R Up L Y B - Street Fighter 2

 

I read that SF2 code and I could almost swear I just heard the "character select" sound effect!