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Bloons Wiki

For the BTD5 counterpart, see Fast Engineering.
Increased efficiency allows the Engineer to produce sentries, foam and bloon traps more often.
~ BTD6 description

Faster Engineering is the Tier 2 upgrade of Path 1 for the Engineer Monkey in Bloons TD 6. 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" Monkey Knowledge upgrade), ignoring attack speed bonuses. This upgrade also increases the rate of producing Cleansing Foam and reduces cooldowns for new Bloon Traps. For these contraptions, their attack speed is increased by +66%, equivalent to an attack cooldown reduction of 40%.

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



Faster Engineering improves the attack speed of Engineer's contraptions, more specifically sentries, Cleansing Foam globs, and generating new Bloon Traps. It increases the overall offensive power of the Engineer by a fair amount.


  • 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.
  • All alternate attacks are deployed at a +66% attack rate. Engineer's main attack remains the same, so use this upgrade to make use of the gadgets made by him.
  • Note that Sentries still last for up to 25 seconds, unless the necessary MK is bought.

Version History[]

Faster Engineering had a similar problem with the Sentry Gun upgrade when the Engineer was first released into the game, as the sentry damage output was too low at the time. In later updates, Sentry Guns were buffed, making the Faster Engineering upgrade more useful too. As for the Faster Engineering upgrade itself, it now has a special interaction with other contraptions that increases attack speed of them.

  • Buff Standard Sentry pierce increased from 1 to 2. (Inherited from Sentry Gun).
  • Buff230 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.
  • Buff 2-2-0 Deconstruction now applies to sentries.
  • Buff 2-0-4 Bloon Trap deployment rate bonus increased (+25% → +66%).


When a sentry is placed:

  • [gadget placement]
  • [gadget placement]


Official artwork[]


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