While the game is paused enter in: [R1], [CIRCLE](2), [R1], [R2], [L1](2), and [L2]. You should hear a sound confirming correct entry
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.
Go to campaign from the menu, and then bonus features and enter the following: Left, Left, Up, Left, Right, Down, Right.