Press R2, L2, Up, Down, Square, Triangle, Circle at the main menu.
Note: Use this cheat at start of mission to get Silent Assassin rating
Note: This cheat will only work after you have been briefed by Diana and you have started the mission. Make sure you push L3 (analogue stick button) firmly down without moving the stick about.
Please note: On previous cheats for this game, "God Mode" & "All Weapons" codes only work on the PAL version of the game, not the US NTSC version