Complete all objectives in the single mission Dossiers. The following codes can now be enabled during gameplay. A message will confirm a correct entry.

Big Heads - Back, A, X, B, Y, A

Chicken Explosives - Back, X[x2], Y, A, B

Invincibility One-player - Back, X[x2], A, B, A

Paper Mode - Back, B, A, X, Y, A

Slow Motion - Back, Y[x2], B, X, A

Team Invincibility: Press B, A, Y, Y, A, B, X, X, X