Finish all of the game's fifty dossier missions and you'll be able to enable the following codes. A message will be heard to confirm.

Press Back, then press Back, A(2), B, X, Back during gameplay -- and your character only will become invisible. You will not be able to complete the game properly if the code is on.

Press Back, then press B, A, Y(2), A, B, X(3).

Press Back then press A, X, B, Y, A during gameplay.

Press Back then press B(2), Y, X(2), A during gameplay.

Press Back then press X(2), Y, A, B during gameplay.

Press Back then press B, A, X, Y, A during gameplay.

Press Back then and press Y(2), B, X, A during gameplay.

Press Back then press X, A, Y, B, X during gameplay.