Pins Bloons in place for a short time when struck.
~ BTD6 description

Pin is the 2nd upgrade of Path 3 for the Engineer Monkey. It allows the Engineer to pin down all affected non-MOAB-class bloons for 1.0s, similar to a stun. This pinning effect cannot affect Lead Bloons or Ceramic Bloons.

It costs $185 on Easy, $220 on Medium, $235 on Hard, and $240 on Impoppable.


  • When further upgraded to Double Gun, it become quite useful against normal bloons.
  • It is best not used after Round 81, as Super Ceramics are generally the only non-MOAB-class bloons that will appear on those rounds.



  • Pin is so far the joint shortest upgrade name in the whole BTD6 franchise, along with IFR from Heli Pilot, although that is an abbreviated name and not a full name.
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