Mortal Kombat 4 Passwords (PSX)

Early on, the development team at Midway decided to make a 3D Mortal Kombat to capitalize on the rising popularity of 3D games at the time. Midway decided to develop its own hardware, named "Zeus" from scratch however, resulting in development delays (a large amount of the game was tested on two dimensional hardware using pre-rendered characters). As revealed in later interviews, programmer Ed Boon was particularly concerned with maintaining the gameplay feel of a 2D game but with 3D graphics. He at first was worried that there was some intrinsic property of 3D graphics that would make this impossible.

One of the reasons this was done was to take advantage of the fluid keyframed and motion captured animation that was now possible using 3D models. For example, in Virtua Fighter, a real martial artist was filmed performing the moves, and this movement was imposed on the 3D model in the game. Thus, while a punch in a 2D game might be a rapidly responding move with two frames of animation, a punch in a 3D game might have a delay between when the button was pressed and when the opponent was hit, owing to the realistic animation. (Wikipedia)

Passwords

MK4 Passwords & Stages
On the VS. screen, enter these Kombat Kodes by using the following buttons:

P1 types in HP, LP, LK (The first 3 numbers)

P2 types in HP, LP, LK (The second three numbers)

The numbers in the Kodes represent how many times that button needs to be pushed.

0 - 2 - 2 - 0 - 2 - 2 - Fight in The Well

0 - 3 - 3 - 0 - 3 - 3 - Fight in Elder Gods Kombat Zone

0 - 1 - 1 - 0 - 1 - 1 - Fight in Goro's Lair

0 - 6 - 6 - 0 - 6 - 6 - Fight in Reptiles Lair

3 - 1 - 3 - 3 - 1 - 3 - Fight in The Ice Pit

2 - 0 - 2 - 2 - 0 - 2 - Fight in the Living Forest

3 - 0 - 3 - 3 - 0 - 3 - Fight in The Prison

1 - 0 - 1 - 1 - 0 - 1 - Fight in the Shaolin Temple

0 - 4 - 4 - 0 - 4 - 4 - Fight in The Tomb

0 - 5 - 5 - 0 - 5 - 5 - Fight in Wind World

Mortal Kombat 3 Codes
On the VS. screen, enter these Kombat Kodes by using the following buttons: The numbers in the Kodes represent how many times that button needs to be pushed. Each combination will have a different effect.

Unlimited Run - 0 - 0 - 1 - 0 - 0 - 1

Untouchable Weapon - 0 - 0 - 2 - 0 - 0 - 2

Maximun Damage Disabled - 0 - 1 - 0 - 0 - 1 - 0

Noob Saibot Mode - 0 - 1 - 2 - 0 - 1 - 2

Bloody Rain (Wind World Only) - 0 - 2 - 0 - 0 - 2 - 0

Explosive Kombat - 0 - 5 - 0 - 0 - 5 - 0

Throwing Disabled - 1 - 0 - 0 - 1 - 0 - 0

Throwing and Maximum Damage Disabled - 1 - 1 - 0 - 1 - 1 - 0

Free Weapon - 1 - 1 - 1 - 1 - 1 - 1

No Power - 1 - 2 - 3 - 1 - 2 - 3

Random Weapon - 2 - 2 - 2 - 2 - 2 - 2

Big Heads - 3 - 2 - 1 - 3 - 2 - 1

Random Kombat - 3 - 3 - 3 - 3 - 3 - 3

Weapons Drawn - 4 - 4 - 4 - 4 - 4 - 4

Many Weapons - 5 - 5 - 5 - 5 - 5 - 5

Silent Kombat - 6 - 6 - 6 - 6 - 6 - 6

Big Head mode is so much fun in MK4: