Go to campaign from the menu, and then bonus features and enter the following: Left, Left, Up, Left, Right, Down, Right.
Go to the campaign and bonus features menu, and enter in Up, Down, Left, Right, Up(2), Down to receive infinite ammo.
To get all robots pause your game and press Up, Down, Up, Right, Right.
While the game is paused enter in: [R1], [CIRCLE](2), [R1], [R2], [L1](2), and [L2]. You should hear a sound confirming correct entry
During the game enter the following: [R2], [L2], Up, Down, X, [L2], [L2].
While playing the game, enter the following: [R2], [L2], Up, Down, X, Up, [L1].
While playing the game enter in the following to gain all weapons: [R2], [L2], Up, Down, X, Up, [SQUARE], X.
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.
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.
Enter this sequence in at the main menu screen: [R2], [R2], [L1], [L2], X, X, [SQUARE], [TRIANGLE].