|I have uploaded screenshots for MK1 using TSearch and playable bosses, as well as screenshot of the Ultratech version for the unlimited continues trick.
MK2 Arcade: I am sure this is known by most already, but Baraka had a Spin Move in earlier revisions, which were later removed, as it makes them too powerful. EGM from January 1994 has a picture of the move:
MK2 Arcade: In the MK2 Arcade Kit video (featured in Midway Arcade Treasures 2/Deluxe Edition), you can see some beta footage from the game, including early versions of Kombat Tomb (the Yin Yang symbol on the background is missing) and The Tower (four big statues placed on both ends of it. Those probably got cut to save memory. Similar statues later appear in Mortal Kombat: Shaolin Monks before the battle with Reptile).
Video HD: https://www.youtube.com/watch?v=iTMMfCeFo00
MK2 Arcade: Regarding "Shawn Attacks", there was an old interview on which Ed Boon said the fake counter was named on his cousin Shawn. The interview transcript was from TotalMK, but seems he take it down.
MK2 DOS: Using TSearch again, you can play as Smoke, Jade and Noob Saibot. They are fully playable, unless you press LP or LK, ast the game will crash. Video of it, can be found below:
I can make screenshots from DosBox regarding this as well.
MK2 DOS: You can use HEX Editor to enable cheat menu by using only 1 key. Open MK2.EXE with any HEX editor, and search for the following string (which corresponds to AICULEDSSUL):
1E 17 2E 16 26 12 20 1F 1F 16 26
Let’s assume you want to set it up so that a single F9 keypress activates the cheat menu. Then replace the above with: 43 00 00 00 00 00 00 00 00 00 00
Info from here: https://cloakedthargoid.wordpress.com/mk2-dos-cheat/
MK2 DOS: Enter the options menu by pressing [F10]. Now type with capital letters "DIP". The switches menu will appear. Unfortunately no one can tell what these switches do, probably nothing.
MK2 Master System: You can play as Kintaro if you choose Shang Stung. To morph into him just hold KICK, hold UP+DOWN+RIGHT and release KICK, and go to the 14 sec massacre.
Only real special move that you can perform is the fireball, the command is F, F, PUNCH, to stomp just jump on the enemy. The only limitation here is the use of DOWN buton, as it will cause the game to freeze.
Video of the Trick on real hardware:
MK2 Master System: Using Game Genie you can access hidden characters and bosses on the select screen: 0DD-164-C4A. Right of Jax is Kintaro; right of Kintaro is Shao Kahn; Right of Shao Kahn is Smoke; Right of Smoke is whats left of Noob Saibot; Right of Noob Saibot is Jade. Pressing down seems to freeze up the game while using bosses show Kahn's sprite will change if jumping.
MK2 Game Gear/Master System: Although the games should be almost identical, the stage fatality combinations works only on Master System for Kitana, Mileena and Shang Tsung, while they don't for Sega Game Gear port. Even with game genie for 1 button stage fatalities, these characters will not perform Spike Fatality.
MK2 Saturn: Regarding the hidden message Gary Liddon left in the game - back in 2000 and he said: "That stuff in mk2 Saturn is in that file on the CD as the items in the file needed to be padded to 2048 byte boundaries. I put the text in cos I thought someone would end up reading it one day which is also why the message is justified to work with 32 byte output. I think that was about the best thing in MK2 Saturn as it was one of the worst games I’ve ever written. Oh well."
MK2 Saturn: Similar to MK2 PSX, the game also contains Switches menu. As soon as the opening cinematic start, enter D, U, L, L, A, R, D, B, Y, C (Saturn gamepad) or D, U, B, B, LP, F, D, BL, Run, LK. Now go to the Main Menu, and you will see a new option named "Switches."
MK2 Saturn: Using Action Replay / Gameshark you can play as hidden characters and bosses. Although glitchy, if you don't use LP, they are somehow playable:
MK2 Playstation: Using Action Replay / Gameshark you can play as hidden characters and bosses. Although glitchy, if you don't use LP, they are somehow playable:
MK2 Playstation: Seems there is also beta ISO released, but I could not find that anywhere. There are even some action replay codes for it: https://gamehacking.org/game/112932
MK2 Saturn/Playstation: Seems both versions requires different way to perform Shang Tsung Kintaro morph fatality.
MK2 Amiga: Shang Tsung Kintaro Morph Fatality is different in this version. In order to perform it, you need to hold Block, Back, Back, Forward, Forward, Up, Up. You need 2MB chip ram min. Otherwise game will freeze before the morping sequence.
Video of it: https://www.youtube.com/watch?v=WCokODjEIGM
Should be noted that PC DOS MKII also contains all hidden text messages from the Arcade Version I believe.
MK2 Playstation: There is a rare Brazilian review build of Mortal Kombat II for the Sega Saturn. Despite the text, changed to Brazilian, everything else seems to be the same: http://hiddenpalace.org/Mortal_Kombat_II_(Jan_2,_1996_build)
MK2 Genesis: A Pre-production version was released (not sure if it was ever dumped). According to the owner, it looks exactly like the retail version: http://mkbible.org/tmp/MK2%20-%20Genesis%20Pre-production%20Sample%20%28face%29.jpg
MK2 Genesis: An even earlier build of the game actually had the names of the fighters displayed under their life bar, much like the SNES version - showed in Sega Visions October-November 1994 (issue 028):
Let me know if screenshots are required for any of the above as well!