Prince of Persia: The Two Thrones

Secret baby rattle weapon:
Successfully complete the game. Press Start to pause game play, then press
Right(2), Left(2), Y, X(2), Y, Down, Up. 

Secret telephone weapon:
Successfully complete the game. Press Start to pause game play, then press
Left, Right, Left, Right, Up, Up, Down(2), Y, X, Y(2), X(2).

Secret swordfish weapon:
Successfully complete the game. Press Start to pause game play, then press
Down, Up, Down, Up, Right, Left, Right, Left, Y, X, Y, X.

Secret chainsaw weapon:
Press Start to pause game play, then press Down(2), Up(2), Right, Left,
Right, Left, Y, X, Y, X.