Killer 8: 100 Serum Vials:
Press Down, R, Up, L, Y, B, X, A(2), at the the "Press Start" screen. The healing sound will confirm correct code entry. You will get the vials when you start Target: Angel. Repeat the level over with the code enabled to get another 100 vials.

Killer 8 mode:
Successfully complete the game under the normal or hard difficulty setting. Young Harman is a playable character in this mode.

Alternate ending sequence:
Successfully complete Killer 8 mode.

Hopper 7 mode:
Successfully complete the game in Killer 8 mode.

100 Serum Vials in Killer 8 mode
At the "Press Start" screen for Killer 8 mode, press Down, R, Up, L, Y, B, X, A. If you entered the code correctly, you will hear the healing sound. You will get the vials when you start Target: Angel. Repeat the level over with the code enabled to get another 100 vials.

Play as Young Harman
Successfully complete the game on the normal or hard difficulty setting to unlock Young Harman.

Killer 8 mode
Successfully complete the game on the normal or hard difficulty setting to unlock the Killer 8 difficulty setting.

Hopper 7 mode
Successfully complete the game on the Killer 8 difficulty setting to unlock the Hopper 7 difficulty setting.

Alternate ending sequence
Successfully complete the game on the Killer 8 difficulty setting to view an alternate ending sequence.

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