Killer 7 Cheats
Killer 8 100 serum Vials
Enter code at the the "Press Start" screen. You will hear the healing sound if you have entered the code correctly. You will get the vials when you start Target: Angel. Repeat the level over with the code enabled to get another 100 vials.
Code: Down, R1, Up, L1, Square, X, Triangle(2)
Alternate ending sequence
After finishing the Killer 8 mode.
Killer 8 mode
After finishing the game under normal or hard difficulty. Young Harman is a playable character in this mode.
Hopper 7 mode
After finishing the game in Killer 8 mode.