Bloons Wiki
Bloons Wiki

Nail gun and Sentry shots do extra damage to MOAB-Class and Fortified Bloons.
~ In-game description

Deconstruction is the 2nd upgrade of Path 2 for the Engineer Monkey in Bloons TD 6. It allows the Engineer to deal +1 damage to Fortified and MOAB-class (or +2 for Fortified MOAB-class). This also applies to sentries spawned by the Engineer.

It costs $295 on Easy, $350 on Medium, $380 on Hard, $420 on Impoppable.



Engineers with Deconstruction sport a yellow jacket, red helmet, and a white pencil with blue lead, and a pink eraser. Only the jacket and pencil remain constant when used as a crosspath.



If extra MOAB-class popping power is needed, Deconstruction is the upgrade to get. For a rather low price, adding it with Sentry Gun will improve the Engineer's blimp-popping power by a large margin. This upgrade makes the greatest difference when combating early MOABs.


  • Do buy this upgrade for improving blimp damage overall. Remember, it improves the nailgun and any spawned sentries.
  • It is a lot more cost-efficient to pair this upgrade with Path 1 in order to make the most of the added extra blimp damage potential.
  • When it comes to just the main Engineer's nailguns, it's less cost-efficient to go for one 0-2-0 Engineer than it is to buy three 0-0-0 Engineers for similar cost, but it's more efficient than adding two 0-1-0 Engineers.
  • The Deconstruction upgrade can be paired with Double Gun for the Engineer himself, but it's generally better to add Sentry Gun for the Double Gun when it comes to extra blimp damage.
  • If not going for Sprockets and its later upgrades, this upgrade tends to be a stepping stone to Cleansing Foam.

Version History[]

Deconstruction's value had been adjusted when Larger Service Area got a major price cut, but remained relatively useless until the upgrade's damage bonuses could also be applied to sentries.

Engineer is quite poor in terms of crosspathing, so we've added crosspath benefits to Cleansing Foam as well as an overall price buff to the middle crosspathing upgrades. [...]
~ Ninja Kiwi
  • Change Deconstruction upgrade costs more ($200 → $350) but the preceding upgrade costs less ($550 → $250).
Sentry Expert has underperformed for a while, so we're adding solid crosspathing buffs to all Sentries. [...]
~ Ninja Kiwi, referring to buffing Engineer crosspaths including Sentry Expert
  • Buff Deconstruction now grants sentries with +1 MOAB damage and +1 Fortified damage.
  • Buff Affected by Larger Service Area custom placements of Traps buff

Description changes[]

  • Change Description changed from "Nail gun shots do extra damage to MOAB-Class and Fortified Bloons." to "Nail gun and Sentry shots do extra damage to MOAB-Class and Fortified Bloons."


Official artwork[]


  • Until the price adjustment to Deconstruction in Version 21.0, the Engineer was the only tower to have all Tier 2 upgrades cheaper than their respective preceding Tier 1 upgrades.