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Killer 7

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  1.     Hints - Hint: Thick Blood & Serum   rating: 0

cGub
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Hints - Hint: 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.