I rented metal gear 2 sons of liberty today, my gameshark has sons of liberty demo on it, so i deleted those codes, got the codes for the actual game online and entered them as shown, then i checked those, and booted the game non of the codes come up when i start the game, i only tired the Unlimeted weapon cheats and the unlimited ration cheats, and none of them show up, if this sounds fimiliar to anyone your help is appreciated

thanks

You have to use the master code too, if its required.