Killer 8 - 100 Serum Vials: At the 'Press Start' screen press Down, R1, Up, L1, Square, X, Triangle, Triangle. Corrrect entry will be confirmed by the 'healing' sound. When you start Target: Angel you will receive the vials, to get another 100 vials repeat the level with the code enabled.
Killer 8 mode: In either 'Normal' or 'Hard' difficulty setting successfully complete the game (Young Harman is a playable character in this mode). In this mode enemy explosions do five times normal damage, clue and map icons are hidden on the map menu and enemy critical spots are invisible. Hopper 7 mode: In Killer 8 mode successfully complete the game. Alternate Ending sequence: Complete Killer 8 mode successfully.