For the BTD5 counterpart, see Fast Engineering.
Increased efficiency produces sentries more often and Foam faster.
~ BTD6 description

Faster Engineering is the 2nd upgrade of Path 1 for the Engineer Monkey in BTD6. It increases the production speed of sentries from every 10.0s to every 6.0s. This allows up to 4-5 Sentries to be placed on the map at once per Engineer (5-6 Sentries with the "Vigilant Sentries" MK). This upgrade doesn't affect the deployment rate of Bloon Trap, but it affects the deployment rate of Cleansing Foam.

It costs $340 on Easy, $400 on Medium, $430 on Hard, and $480 on Impoppable.

Tips[edit | edit source]

  • As Sentries no longer consume footprint, it should no longer be a problem to increase production speed of sentry-building without interrupting placement of other towers.
  • Note that Sentries still last for up to 25 seconds, unless the necessary MK is bought.

Version History (BTD6)[edit | edit source]


Buff.png Standard Sentry pierce increased from 1 to 2. (Inherited from Sentry Gun)



  • Buff.png230 Faster Engineering increases Cleansing Foam rate 2 to 1.2


  • Description changed from "Increased build speed produces sentries more often." to "Increased efficiency produces sentries more often and Foam faster."
    • Reflected 21.0 crosspathing change.

Trivia[edit | edit source]

  • The BTD5 version of this upgrade is named "Fast Engineering" without the "-er" suffix.
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