Ultimate Mortal Kombat 3

Free play mode:
Press Up(2), Right(2), Left(2), Down(2) at the copyright, purple skull, high score, or demo battle screens. Shao Kahn will say "Excellent" or "Superb" to confirm correct code entry.

Keep wins with free play:
Complete the game and select the Battle with Ermac option. Finish the fight with a mercy, then beat him again. The "Choose your destiny" screen will appear without using any credits and your record from the previous game will be retained.

65,535 kredits:
Start a one player game and allow the CPU to defeat you on all five kredits. Push Start on controller two immediately after losing the second round of the fifth match. The play mode screen will appear. After Shao Kahn laughs three times, you will automatically enter the Mortal Kombat option. If you die during any subsequent match, the continue screen display 65,535 kredits remaining.

Cheat menu:
Press C, R, A, Z, Y, C, Y, R, A, X at the copyright, purple skull, high score, or demo battle screens. Shao Kahn will laugh to confirm correct code entry. Press Up at the Kombat Cube to display a blue "?", which contains the cheat menu with the following options: Free Credit, Mileena, Ermac, Classic Sub Zero, Fatality time, One round matches.

Fight as Human Smoke:
Select Cyber Smoke at the character selection screen and hold Left + Run + BLK + HP + HK at the start of the round. For player two, substitute the code with Right + Run + BLK + HP + HK.

Random character selection:
Press Up + Start at the character selection screen.

Scorpion's Lair "Crispy" fatality:
Hold both Run buttons after performing the stage fatality on Scorpion's Lair to hear Shao Kahn say "Crispy". Hold both HP buttons to see Dan Forden appear and say "Crispy". Hold both Run buttons and both HP buttons to hear Shao Kahn and Dan Forden both say "Crispy".

New opening quote:
Press Down, Up, Left(2), A, Right, Down while Shao Khan is laughing on the opening purple skull screen. The opening will change from "There is no knowledge that is not power" to "Imagination is more important than knowledge".

Shao Khan's treasures:
The first ten treasures are available at various difficulty levels. The last two treasures are available after winning an eight person tournament or defeating Shao Khan on the 4th Tower (path select).

1 (Dragon): Outcome
2 (MK): Play Galaga
3 (Yin Yang): Fight Ermac
4 (3): Fight Noob Saibot
5(?): Random
6 (Lightning Bolt): Fatality demo 1
7 (Goro): Fatality demo 2
8 (Raiden): Fatality demo 3
9 (Shao Kahn): Fight Noob Saibot and Ermac
10 (Skull): Classic Match
11 (?): Mega-endurance Match
12 (?): Supreme Demo

Kombat Kodes:
Enter one of the following Kombat Kodes to unlock the corresponding cheat function.

Effect	Kombat Kode
Mileena	700 723
Classic Sub Zero	760 520
Ermac	964 240
Streets stage	079-035
Bridge stage	077-022
Shao Khan's Cave	004-700
Ermac's Portal	933-933
Noob Saibot's Dorfen	050-050
Subway stage	880-088
Scorpion's Lair (Hell)	666-444
Pit 3 stage	820-028
Roof Top stage	343-343
Soul Chamber stage	123-901
Temple stage	600-040
The Waterfront stage	002-003
The Grave Yard stage	666-333
Jade's Desert stage	330-033
Bell Tower stage	091-190
Shao Khan's Tower stage	880-220
Player 1 half energy	033-000
Player 2 half energy	000-033
Player 1 quarter energy	707-000
Player 1 quarter energy	000-707
Super endurance mode	024-689
Player 1 does half damage	390-000
Player 2 does half damage	000-390
No special moves	555-556
Combos disabled	722-722
Unikkorn Referi-Sans Power	044-440
Throwing disabled	100-100
Blocking disabled	020-020
Real Kombat	040-404
Psycho Kombat	985-125
Randper Kombat	444-444 or 460-460
Dark Kombat	688-422
Silent Kombat	300-300
Fight Classic Smoke	205-205
Fight Noob Saibot	769-342
Fight Motaro	969-141
Fight Shao Khan	033-564
"Go See The Mk Live Tour"	550-550
"Rain Can Be Found In The Grave Yard"	717-313
"There Is No Knowledge That Is Not Power!"	123-926
"Pub! D.K.P."	300-003
"It Should Work!?"	200-002
"It's Your Sprite Routine! M.A.H."	100-001
"Hold Flippers During Casino Run"	987-666
"No Fear, Max Countdown, E B Button,Skydive"	282-282
"Whacha Gun Do? E.B."	004-400
"Skunky!!"	122-221
"Don't Jump At Me"	448-844
Invisible energy bars	987-123
Display revision #	999-999
Unlimited run	466-466
Super endurance	024-689
Hyper run jumps	321-789
Play Galaga	642-468
Uppercut recovery	788-322

Hint: Noob Saibot's name:
This hidden character's name is a backwards spelling of "Tobias Boon", which is derived from the co-creators of the Mortal Kombat series; John Tobias and Ed Boon. Ed Boon also provides the voice for Scorpion.
Information in this section was contributed by EdgeCrusher.

Hint: Easier moves:
To perform a finishing move that contains an "Up" command, it may be easier to hold Block for performing the movement commands to stop you from jumping. Then release Block for any attack commands.
Information in this section was contributed by EdgeCrusher.