Since it came up in another thread, 656A-47AF is the game genie code to fight against or even with Reptile in MK1. Use it and you will fight against reptile every round. Use it during a two player game and you can turn a ninja green with it and control him. He will be a green ninja with Reptile in the energy bar, but he will be either Scorpion or Sub Zero, he won't do both sets of moves.

6D67-3FOD - Get reptile on any level after a double flawless and a fatality.
99BC-370F - First person to get 2 hits wins.
ED6A-47AF - Test your might after every match.

I had a ton of MK2 ones but I dont know where they got to, I will have to see if I still have them in a text file somewhere.

http://www.gamegenie.com/cheats/gamegenie/snes/mortalkombat.shtml
http://www.gamegenie.com/cheats/gamegenie/snes/mortalkombat2.shtml
http://www.gamegenie.com/cheats/gamegenie/snes/mortalkombat3.shtml

That last code on the MK3 page will let you fight Noob Saibot, but I thought he was only in the arcade MK3??

nope... Noob Saibot was indeed in every version of MK3 (except for gameboy). I didn't find him as a hidden character... or at least as much as he was in MK2. You never hear of his MK3 appearance, ever

I think thats because his MK3 appearance was so lackluster. I mean, a blacked out Kano with no special moves is no fun at all.

Im wondering does anyone know if Noob Saibot is playable in any MK3 console with use of a game genie/ gameshark or any other cheating device?

Well I know in the Genesis version of MK3 with a PAR code you can play as him, but if you try to do any attacks with him, the game will freeze so he is totally unstable.

I was trying to find a game genie code or action replay code for mortal kombat 1 for super nintendo that automatically fills the test your might bar does anyone know of one I know the sega genesis version has one