Mortal Kombat 4

Kombat Kodes
Enter these at the Vs screen. To change each of the numbers, use: 1 - Low Punch, 2 - Block, 3 - Low Kick, 4 - P2 Low Punch, 5 - P2 Block, 6 - P2 Low Kick
Code
Effect
123 123
One-Hit Win
012 012
Noob Saibot Mode
020 020
Red Rain
050 050
Explosive Kombat
002 002
Weapon Drawn and can't get knocket out of hands
100 100
Disable Throws
010 010
Disable Max Damage
110 110
No Throw/Disable Max Damage
111 111
Free Weapon
222 222
Start with Random Weapon
333 333
Randper Kombat
444 444
Start with Weapons Drawn
555 555
Many Weapons
666 666
Silent Kombat
321 321
Big Heads
Stage Select
Enter these the same way as above:
Code
Stage
011 011
Goro's Lair
022 022
The Well
033 033
Elder God's
044 044
The Tomb Stage
055 055
The Rain Stage
066 066
Snake Stage
101 101
Shaolin Temple
202 202
Living Forest
303 303
Prison
313 313
Ice Pit
Cheat Menu
Kombat Kode: 302 213. Next, quit the game and go back to the Options screen. Highlight "Versus Screen Enabled" and hold Run + Block for 10 seconds.

-----------------------------------------------------------------------
 Mortal Kombat Mythologies: Sub Zero

Various Cheats
Enter these at the password screen:
Effect
Code
Final Stage
XJKNZT
Infinite Lives
GTTBHR
Fill Inventory
NXCVSZ
Big Cheat
zchrry
View End Credits
GRVDTS

-----------------------------------------------------------------------
 Mortal Kombat Trilogy

Secret Options
Go into Options, then hold L1 + L2 + R1 + R2, until you hear a boom and the screen will shake. Now, the "?" is selectable.
Play as Classic Characters
At the character select screen, highlight Rayden, Jax, Kano, or Kung Lao and Select.
Play as Chameleon
Go to Human Smoke and hold Left + R1 + R2 + Triangle + Sqaure. When the round starts, Human Smoke will become Chameleon.
Stage Select
Go to the character select screen and highlight Sonya, press Up + Start.
Unlimited Credits
At the Story screen, press Down, Down, Up, Up, Right, Right, Left, Left.