I believe I have solved the riddle behind the Text Message Versus screen code in Ultimate MK3. The code 717313 displays a text message at the bottom of the screen Rain Can Be Found In The Graveyard. We know 100% that Rain is not playable or fightable in the arcade version of Ultimate MK3 but when we first saw this message a lot of fans believed there was something you do in The Graveyard to access Rain. I belive I have figured it out and it is quite simple. The text message has nothing to do with the character of Rain at all, it has to do with rain. The text message doesn't really say "Rain can be found in the Graveyard", it actually states that "rain can be found in the Graveyard".
Basically if you think about it in every horror film featuring a graveyard scene almost always it is raining. So 717313 states that the element of rain, can be found in the Graveyard. It is all about the water element rain, and not the character Rain.
Thoughts? Opinions?