Nintendo GameCube

Killer 7

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Unlock Playable character: Young Harman

Complete full game on normal or hard mode

Unlock Killer 8 hard mode

Complete full game on normal or hard mode

100 blood vial on killer 8 mode

At any point pause the game and press down, right, up, left, Y, B, X, A.If the code worked correctly you should hear the healing noise and have 100 blood vials.

Unlock Hopper 7 mode

Complete Killer 8 mode

Thick Blood & Serum

Thick blood is not carried over from stage to stage, but serum is. The blood machine in each stage will cease to function if you revisit the stage, so learn to collect as much thick blood as possible in a stage and break the machine before moving on.