Killer Instinct Gold 

Unlock all options 
When a character profile appears during the story introduction:
press Z, B, A, L, A, Z. If you entered the code correctly, a voice will say "Perfect".

Enable all costume colors 
When a character profile appears during the story introduction:
press Z, B, A, Z, A, L. If you entered the code correctly, a voice will say "Welcome".
Then,press Up or Down at the character select screen to display all available colors.

Play as Gargos 
When a character profile appears during the story introduction:
press Z, A, R, Z, A, B. If you entered the code correctly, you will hear a laugh.
Then, Gargos will be accessible in the character selection screen.
Note: Gargos can not be selected in training and focused training mode.

Display ending credits 
When a character profile appears during the story introduction:
press Z, L, A, Z, A, R. Then, the credits that are normally shown only after winning the game will be displayed.

Random character select 
When selecting a character:hold Up and press Start.

View the high score screen 
At the main menu, press Z.