Killer Instinct 2

Fight as Gargos:
Hold Up and press Fierce Punch, Medium Punch, Medium Kick, Fierce Kick, Medium Punch, Quick Punch, Quick Kick, Medium Kick at the character selection screen.

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

Alternate costumes:
Highlight a fighter, then press Up or Down at the character selection screen.
Information in this section was contributed by ktu95a2391.

Faster game:
Select two player mode, then press Down + Medium Punch or Medium Kick before selecting a fighter at the character selection screen.

Fastest game:
Select two player mode, then press Down + Fierce Punch or Fierce Kick before selecting a fighter at the character selection screen.

Reset speed to normal:
Select two player mode, then press Down + Quick Punch or Quick Kick before selecting a fighter at the character selection screen.

Stage and music select:
Select two player mode, then enter one of the following codes after selecting a fighter at the character selection screen. The first player to enter the code will select the stage, while the second player to enter the code will select the music.

Ship
Press Down + Fierce Kick.

Spinal's Ship
Press Down + Medium Kick.

Dojo
Press Down + Quick Kick.

Bridge
Press Down + Quick Punch.

Museum
Press Up + Medium Kick.

Jungle
Press Up + Medium Punch.

Stonehenge
Press Up + Quick Kick.

Sabrewulf's Castle
Press Up + Quick Punch.

Spaceship
Press Up + Fierce Punch.

Helipad
Press Up + Fierce Kick.

Street
Press Down + Fierce Punch.

Dungeon
Press Down + Medium Punch.

Sky
Press Down + Medium Kick simultaneously on both sets of controls.