I've been working my butt off on some special things to put up for MK and MK2 that involves playing as the bosses, or other strange oddities and well-kept secrets from the MK world.

This is, however, going to be a growing list. I was originally going to start this post with the Genesis versions of MK and MK2, but due to myself not being able to acquire the cheat codes I need to do as such, I'll have to save it for another post.

I do not take all the credit for things such as the actual codes themselves, rather, I've painstakingly taken the time to research further into the codes themselves. All codes are in Pro Action Replay form for easier use in emulators, and the fact that not all PAR codes can be changed into a Game Genie code to get the same effect.

My ultimate goal is that maybe some ROM hacker can come in, see this, and have some fun with some MK ROMs by making the unplayable characters playable ones, kinda like in that UMK3 Hack thread, but just with the originally unplayable characters and not making it like MK Trilogy. And as a quick side note, some definitions: Freeze: The game locks up, but no other weird side effects happen. Jumble: The graphics become distorted in any way. Blackout: The screen goes black and locks up. Crash: The game quits. On some emulators, the program will just quit.

Anyway, let the weirdness begin!

Mortal Kombat 1 (Arcade)

Play as Goro
Code: (Available on the MAME Cheat List)

Standard Actions:
Forward: Move Forward
Backward: Move backwards in a weird back-stagger.
Up: Game freeze, reset.
Down: Blocking animation, does nothing.
Low Punch: Game freeze, reset.
High Punch: Game freeze, reset.
Low Kick: Game freeze, reset.
High Kick: Game freeze, reset.
Block: Game freeze, reset.

Combo Actions:
Down + Low Punch: “Slip & Flip”, game crash.
Down + High Punch: “Slip & Flip”, game crash.
Down + Low Kick: Taunt without sound, hold to stay in pose.
Down + High Kick: Taunt without sound, hold to stay in pose.
Down + Block: Instant Crash

Play as Shang Tsung
Code: (Available on the MAME Cheat List)

Standard Actions:
Forward: Move forward.
Backward: Move backwards in fireball-shooting pose.
Up: Instant Crash
Down: Johnny Cage shape morph
Low Punch: Shang Tsung spazzes out, can’t move or attack, blocking crashes game.
High Punch: Shang Tsung disappears, crashes instantly after.
Low Kick: Shang Tsung disappears, can’t really do much, blocking crashes game.
High Kick: Partial disappearance attack. Can hit from any length on screen!
Block: Instant Crash

Combo Actions:
Back, Forward: Instant Crash
Down + Low Punch: Liu Kang shape morph. Glitchy & Temporary.
Down + High Punch: Liu Kang shape morph. Glitchy & Temporary.
Down + Low Kick: Sonya shape morph. Hold to retain.
Down + High Kick: Sonya shape morph. Hold to retain.
Down + Block: Instant Crash

Mortal Kombat 2 (Arcade)

Play as Kintaro
Code: (Available on the MAME Cheat List)
[NOTE: On the current list, the correct code is at the bottom of the list.]

Standard Actions:
Forward: Instant Crash
Backward: Instant Crash
Up: Jump, done in throw animation.
Down: Uppercut animation, then crashes.
Low Punch: Hold to make Kintaro’s animation speed up. Release to freeze.
High Punch: Hold to make Kintaro slip and fall. Release to crash.
Low Kick: Instant Crash
High Kick: Hold for victory pose attack. Release to freeze.
Block: Hold to go into a “getting up” block animation. Release to crash.

Play as Shao Kahn
Code: (Available on the MAME Cheat List)
[NOTE: On the current list, the correct code is at the bottom of the list.]

Standard Actions:
Forward: Instant Crash
Backward: Instant Crash
Up: Jumps, morphs into spear thing. Can be hit out with some moves. Faster animation.
Down: Uppercut animation, then crashes.
Low Punch: Shoulder attack, then crashes.
High Punch: Stagger back, then crashes.
Low Kick: Instant Crash
High Kick: Hold for fast laughing animation. Release for crash.
Block: Falls and gets up for blocking, then crashes.

Play as Smoke
Code: (Available on the MAME Cheat List)
[NOTE: On the current list, the correct code is at the bottom of the list.]

Standard Actions:
Forward: Instant Crash
Backward: Instant Crash
Up: Jump
Down: Duck
Low Punch: Hold for low punch release to crash.
High Punch: Hold for high punch, release to freeze.
Low Kick: Hold for low kick, release to freeze.
High Kick: Hold for high kick, release to freeze.
Block: Block.

Play as Noob Saibot
Code: (Available on the MAME Cheat List)

Standard Actions:
Forward: Instant Crash
Backward: Instant Crash
Up: Jump
Down: Duck
Low Punch: Hold for low punch, release to crash.
High Punch: Hold for high punch, release to freeze.
Low Kick: Instant Crash
High Kick: Hold for high kick, release to crash.
Block: Block.

Play as Jade
Code: (Available on the MAME Cheat List)

Standard Actions:
Forward: Game freeze.
Backward: Game freeze.
Up: Jump
Down: Duck
Low Punch: Hold for low punch, release to freeze.
High Punch: Hold for high punch, release to freeze.
Low Kick: Instant crash.
High Kick: Hold for high kick, release to crash.
Block: Block

Mortal Kombat 1 (SNES)

Play as Goro
Code: 7E002207

Standard Actions:
Forward: Move forward.
Backward: Game glitch and blackout.
Up: Game glitch and blackout.
Down: Game freeze.
Low Punch: Game freeze.
High Punch: Game freeze.
Low Kick: Game freeze.
High Kick: Game freeze.
Block: Block

Combo Actions:
Forward + Up: Goro poses, then game freeze.
Forward + Down: Semi-block animation.
Forward + Down + Low Punch: Falls, flips to feet, poses.
Forward + Down + High Punch: Falls, flips to feet, poses.
Forward + Down + Low Kick: Pose, grab animation until release.
Forward + Down + High Kick: Pose, grab animation until release.
Forward + Down + Block: Opponent stare-off if block is held. Release to taunt.

Play as Shang Tsung
Code: 7E002208

Standard Actions:
Forward: Backwards movement.
Backward: Game freeze.
Up: Game freeze.
Down: Game freeze.
Low Punch: Blackout/freeze/jumble
High Punch: Game freeze.
Low Kick: Blackout/freeze/jumble
High Kick: Game freeze.
Block: Game freeze.

Combo Actions:
Forward + Up: Semi-Morph, crashes.
Forward + Down: Johnny Cage morph (shape only)
Forward + Down + Low Punch: Liu Kang morph (shape only)
Forward + Down + High Punch: Liu Kang morph (shape only)
Forward + Down + Low Kick: Sonya morph (shape only)
Forward + Down + High Kick: Sonya morph (shape only)
Forward + Down + Block: Hold Block for Scorpion morph, release for Sub-Zero morph.
(shape only)

The Courtyard II
Code: 8084CBA9 + 8084CC07

Description:
Bizarrely enough, there really are two Courtyard arenas in this game. This stage shows up after you fight in the regular Courtyard, and it either seems to be 90% complete, or a test stage of some sort. Instead of “The Courtyard” on the versus screen, it calls it “Throne Room”. It doesn’t play the typical music track, however. It actually plays the music that normally plays when you fight Goro! However, the only thing you can’t do on this level is your character’s fatality, or the game will go haywire in an ultra-slowdown, then freeze completely. Otherwise, it seems to be fully playable.

Reptile

The biggest thing about Reptile is that unlike most games, where the character has his or her own set of values that point to that character, Reptile is more or less a “patch” character. Rather than being a separate character, it’s basically just taking Scorpion and Sub-Zero in the same match, overriding them with a Green pallete and a life bar, and upping their speed. Therefore, normal character select codes will NOT work to get Reptile to be playable. To do such a thing, you’ll have to use multiple codes.

The normal character modifier code blacks out after Shang Tsung, so this is proof that Reptile does not exist in a normal character sense.

The Pro-Action Replay code “8084CF87” accesses Reptile to some degree. It only changes your character to his pallete and switches the life meter name to Reptile. You must select Scorpion or Sub-Zero. However, you will either have Scorpion or Sub-Zero’s moves, depending on who you choose, and you won’t have his speed either.

Also, this code acts as an “Always fight” character, so you’re always going to be fighting Reptile as Player 2, be it computer controlled or human.

So what does this mean? Anyone who can hack codes to have both Scorpion and Sub-Zero’s movesets available at the same time, and a code to speed up Player 1 will result in having a fully-playable Reptile as your character!

Mortal Kombat 2 (SNES)

Play as Kintaro
Code: 7E2EF80C

Standard Actions:
Forward: Freeze.
Backward: Blackout.
Up: Jump with throwing animation.
Down: Uppercut animation, chance of jumble & blackout.
Low Punch: Hold to speed up animation. Release to freeze.
High Punch: Hold to make Kintaro slip and fall. Release to jumble/blackout.
Low Kick: Slip and fall attack.
High Kick: Victory pose attack. Release to freeze game.
Block: Blocks, looks like getting up and staggering poses though.

Play as Shao Kahn
Code: 7E2EF80D

Standard Actions:
Forward: Blackout
Backward: Blackout
Up: Jumps, morphs into spear.
Down: Uppercut motion, chance of jumble & blackout.
Low Punch: Shoulder attack in place, release to freeze.
High Punch: Hold to stagger, release to freeze.
Low Kick: Game freeze.
High Kick: Laughing animation incredibly fast. Release to blackout.
Block: Blocks, looks like he gets up and shrugs it off. Get hit to block normally.

Play as Smoke
Code: 7E2EF80E

Standard Actions:
Forward: Slide off-screen, game freeze.
Backward: Game freeze.
Up: Jump
Down: Duck
Low Punch: Press to do a low punch, release to blackout.
High Punch: High Punch
Low Kick: Blackout
High Kick: Press to do a high kick, release to blackout.
Block: Blocks

Play as Noob Saibot
Code: 7E2EF80F

Standard Actions:
Forward: Slides off, game freeze.
Backward: Freeze
Up: Jump
Down: Duck
Low Punch: Press to do a low punch, release to freeze.
High Punch: High Punch
Low Kick: Freeze
High Kick: Press to do a high kick, release to freeze.
Block: Block

Play as Jade
Code: 7E2EF810

Standard Actions:
Forward: Slides off-screen, game freeze.
Backward: Slides off-screen, game freeze.
Up: Jump
Down: Duck
Low Punch: Press to do a low punch, release to freeze.
High Punch: High Punch
Low Kick: Press to do a low kick, release to freeze.
High Kick: Press to do a high kick, release to freeze.
Block: Block