Fight as Eyedol:
Highlight Cinder on the character selection screen in one or two player mode. Then, hold Right and quickly press L, R, X, B, Y, A at the Vs. screen. A voice will say "Eyedol" to confirm correct code entry.

Practice against Eyedol:
Begin game play and intentionally lose when facing Eyedol. Allow the timer to expire on the "Game Over" screen. Select practice mode to fight against a helpless Eyedol.

Random fighter selection:
Hold Up and press Start at the character selection screen.

Alternate costume:
Press Up or Down while selecting a fighter.

Slow motion:
Hold Left and all three Kick buttons at the Vs. screen.

Turbo:
Hold Right and all three Punch buttons at the Vs. screen.

Turbo level 2:
Hold Right and all three Kick buttons at the Vs. screen.

Turbo level 3:
Hold Left and all three Punch buttons at the Vs. screen.

Stage select:
Choose the fighters in a two-player game by holding one of the following buttons. Keep the buttons held until the match begins.

Killer Instinct Combo Breaker
At the Vs. screen when you see both fighters, hold Down then press Start. You will here someone say "C-c-c-combo breaker." Now, when you fight you can do combos and combo breakers at any strength.

Killer Instinct Play as Eyedol
In either a one- or two-player game, pick Cinder. At the Vs. screen, press and hold Right. Continue to hold Right and press L, R, X, B, Y, A. You should hear a voice say "Eyedol."

Killer Instinct Practice Against Eyedol
Fight your way up to Eyedol, then let him kill you. At the game-over screen, let the timer run down and then go to "Practice", pick your character, then you'll be practicing against Eyedol.

Killer Instinct Reincarnation
After you are killed and are swaying back and forth, just start hitting buttons rapidly (except for Start or Select.) You will then be reincarnated, and will have double strength. But if you get hit, and it only takes one hit, you are totally dead.

Killer Instinct Secret Stage
Choose a TWO-PLAYER game. At the Character Select screen, have both players choose a character, then hold DOWN and press MEDIUM KICK to select it.

Killer Instinct Turbo Mode
Start a one-player game and pick your fighter. At the Vs. screen, hold Right, and simultaneously press all three Punch buttons. You should hear a punch sound. Now you can play the game at twice the normal speed.

Killer Instinct Option Screen during gameplay
To make the Option Screen appear during game play, go to the vs. Screen and press Down + Start. You cannot change the difficulty setting.

Killer Instinct Knock your opponent of the top of buildings.
At the end of a match when the screen turns red( you have to be on top of a building like Orchi's or Spinal's levels) The opponent has to be at the edge of the building. Then just do a special move to knock him/her off!

Killer Instinct Humiliation
At the character select screen choose cinder, kill your opponent until the backround flashes red then press BACK,BACK,A if correct your opponent will start dancing!