im re-posting this from another thread, because too manny people just keep posting questions and speculations that boil down to being just plain wastes of their time and energy.
so before you waste a weekend trying codes, or impossible acts of game experteese...
or just post a question that will get you alot of flames,
you should first know all of the following...

Fight Night:
the development team (including Ed Boon) was asked about the 'secret' hallway, which leads off to the left in the main menu screen...

the team did say at fight night that the halway exists. it was going to be for mabey accessing a cheat menu, but they said also that it ended up not being used.

they said therfore (or at least seemed to say), that there was no cheat menu.

they also said there are no more
'alities'in the game...
no 2nd fatalities,
brutalities,
animalities,
babalities,
or frendships.

they said there were no stage fatalities.

they said that arena barriers could not be shut off, or broken.

they were asked about the drum arena story, and about getting a draw game as the story sugjests.
the team replied that due to the way it was intentionally programmed a draw game in MKDA is impossible. you will not see it, EVER. this is true, try it at home kids.

they were asked about the voices in the krypt (which i myself have never actually heard), and 12:43 (or whatever it is) the team responded that they did not know what we were talking about. and that these things must most likley be inside jokes and such, done by people in the graphics and sound areas (after all, if they needed a creepy sound in the krypt, why not a garbled voice of somekind? if it were only there for effect, it wouldn't matter what was said. as long as it was mysterious sounding), and these things should not be taken so seriously.

they were asked about more secret characters, and as i recall the answer was no.

as to the version number code (rumor), which was reported After fight night...
if the final secret is a version code then whatever, i kind of understand why, if it is tho...

the version number is a throwback to the arcade machines.
in the arcade releases of MK, the version number of the machine told you if the glitches were fixed, or if all the fatalities were available.
arcade MKs were released incompleate, without all fatalities and lots of unknown glitches.
every few months upgrade chips were installed, updateing the version number, and slowly compleating the game.

to get the version number on an MK ARCADE machine,
you would shut off the machine by throwing the switch located on top of the cabinet, in the back left (player 1 side) corner.

turn it back on, and it will display a system check on the monitor.
at some point during the reboot it will display the version number.
(you may need to hold both start buttons, i can't quite remember... it did somting, it might be just to skip the system check and go right to the reboot)

this is the only reason i can think of that they would include this in MKDA, out of a sense of nostalgia, but why would there be differant numbers? it was said that the code reveals differant numbers on differant coppies of the game... why?
judging by the strat thread we are all playing the same version. and anyway, ive never seen the code posted(trust me i watch) and i never read anyone say they had seen or done it.

anyway, with all the things they said deffinitly were NOT in the game, unless it has some bearing on actual gameplay, i don't really care what the secret is.