Infinite Serum Vials in Killer 8 Mode:
At the Press Start screen, press Down, R, Up, L, Y, B, X, A. You get 100 serum vials every time you begin the first level. Just keep re-entering the first level to get as much serum as you want.

Game Mode Unlockables:

Beat the game on Normal or Hard	Killer8 Hard Mode + Young Harman playable character
Beat Killer8 Mode	Hopper7 Mode

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