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, 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.

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

Unlock Hopper 7 mode
Complete Killer 8 mode.

Unlock Killer 8 Hard mode
Complete full game on Normal or Hard mode.

Unlock Young Harman
Complete full game on Normal or Hard mode.

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