i love all cheat codes especially Infinite Health/Invincible, Inifinte Money, etc
check out Mortal Kombat's other cheat-
Down, Up, Left, Left, A, Right, Down
it's spell Dullard! lol and very easy to activate this code
i also remember MK 2 had Test Codes
both from Genesis by the way
my first cheat code software was Game Genie for Genesis. i now have Codebreaker for my PS2