Daegon:
Press R1, L1, Triangle, Down, Down, Square at the "?" box inside
the Krypt.

Meat:
Press Up, Square, Square, Circle, Circle, Up at the "?" box
inside the Krypt.

Taven:
Press L2, Left, R1, Up, Circle, Down at the "?" box inside the Krypt.

Drahmin's alternate costume:
Press L2, Right, X, R2, Up, Up at the "?" box inside the Krypt.

Frost's alternate costume:
Press Down, R2, R1, L1, Circle, L2 at the "?" box inside the Krypt.

Nitara's alternate costume:
Press Down, L1, Up, L1, L1, Right at the "?" box inside the Krypt.

Shang Tsung's alternate costume:
Press L1, Left, Up, Circle, Up, L2 at the "?" box inside the Krypt.

Falling Cliffs arena:
Press R2, Circle, Square, X, Circle, Triangle at the "?" box
inside the Krypt.

General Reiko's Map Room arena:
Press R2, Triangle, R1, Up, X, X at the "?" box inside the Krypt.

Nethership Interior arena:
Press R1, Left, Left, Down, L1, Square at the "?" box inside the
Krypt.

Pyramid Of Argus arena:
Press R1, L1, Square, X, R2, Up at the "?" box inside the Krypt.

Red Dawn Arena:
Press Circle, L1, Up, Square, Circle, Down at the "?" box inside
the Krypt.

Shinnok's Spire arena:
Press Left, Left, Circle, Up, Triangle, L2 at the "?" box inside
the Krypt.

Mortal Kombat: Armageddon promo movie:
Press Up, Up, Down, Up, L1, X at the "?" box inside the Krypt.

Armory music:
Press X, Square, Left, Triangle, Square, X at the "?" box inside
the Krypt.

Lin Kuei Palace music:
Press L2, Left, Circle, X, R2, Right at the "?" box inside the Krypt.

Pyramid Of Argus music:
Press Down, Left, R2, L2, Up, L1 at the "?" box inside the Krypt.

Tekunin Warship music:
Press Up, Circle, L1, R1, R1, X at the "?" box inside the Krypt.

Pyramid Of Argus concept art:
Press Triangle, Left, Left, X, Down, Circle at the "?" box inside
the Krypt.

Blaze concept art:
Press L1, Triangle, L2, L2, R1, Square at the "?" box inside the
Krypt.

Early Taven concept art:
Press Up, X, R2, Down, L2, X at the "?" box inside the Krypt.

Firewall arena concept art:
Press Up, Square, R1, L2, Circle, L1 at the "?" box inside the Krypt.

Ed Boon concept art:
Press L1, Left, Up, Circle, R2, L1 at the "?" box inside the Krypt.

Mileena's car design concept art:
Press R2, Right, Up, R1, Triangle, Up at the "?" box inside the Krypt.

Sektor's Pulse Blade concept art:
Press R2, L1, Left, X, Up, R1 at the "?" box inside the Krypt.

Unused Konquest Trap concept art:
Press Circle, R2, Triangle, Down, Circle, Left at the "?" box
inside the Krypt.