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Extra deadly spikes can pop through 2 layers per spike.
~ BTD6

Deadly Spikes is the fourth upgrade of Path 3 for the Spike Factory in BTD6. It allows all spikes of the Spike Factory to pop two layers instead of one layer, effectively doubling its power. It costs $2,975 on Easy, $3,500 on Medium, $3,780 on Hard, and $4,200 on Impoppable.

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