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.


  • Avoid purchasing this upgrade unless Berserker Brew is not available. Berserker Brew adds +1 damage, +2 pierce, and ~+10% attack speed for the Spike Factory. Note that 3-0-0 Berserker Brew costs just $2400 on Medium; literally saving $1100 plus extra benefits, in spite of the brew effect having only 62.5% uptime.
  • Deadly Spikes is not reliable at soloing Camo Bloon rounds, particularly Rounds 51. It is better off choosing an alternate option to counter Camo Bloons, such as a 4-x-x Bloonjitsu or by adding in a cheap form of decamo such as Submerge and Support or Counter-Espionage.
  • By itself, a 0-2-4 Deadly Spikes is less reliable than a 3-2-0 Spiked Balls at general cleanup. However, when paired with Berserker Brew, Deadly Spikes becomes a somewhat decent cleanup option, though both options may still become overwhelmed by large hordes of bloons.


Deadly Spikes is a very situational upgrade that is best avoided until the Long Life Spikes Spike Factory is affected by relatively low-cost buffs such as Berserker Brew and/or Jungle Drums. The upgrade alone is more expensive than adding an external buff, but there can be a few select occasions where just adding this upgrade can be useful. For example, it can tank leaking Camo Bloons reasonably well, but it cannot solo the Camo Ceramics on Round 51 or the rushes of Camo Rainbows on Round 56.

Version HistoryEdit


Buff Deadly Spikes now attacks 4x as fast for the first 2.5s of a round.




  • This upgrade is the second upgrade in the Bloons TD series to use the word "Deadly", the first being "Deadly Precision".
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