Enter this sequence in at the main menu screen: [R2], [R2], [L1], [L2], X, X, [SQUARE], [TRIANGLE].
Enter this sequence at the main menu screen: [R2], [R2], [L2], [L2], X, X, [TRIANGLE], [SQUARE]. You should hear a loud roar from Armor King if done correctly.
At the main menu screen of the game enter in [R1], [L1], [R2], [L2], X, X, [CIRCLE], [TRIANGLE].
At the main menu screen of the game enter in: [R1], [L1], Up, Up, Down, Down, Start. If done correctly you will hear a laugh from Kazuya.