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Increased Production (BTD4) or Faster Production (BTD5) is the second upgrade for the Spike Factory (BTD4) or the first upgrade of the second path (BTD5). This upgrade makes the Spike Factory produce spikes about 50% faster.
- BTD4: $595 (Easy), $700 (Medium), $755 (Hard)
- BTD5: $680 (Easy), $800 (Medium), $865 (Hard), $960 on (Impoppable)