Killer 7 Cheats on GameCube

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.

Alternate ending sequence

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

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.