Massive nails pop 8 bloons at once, and pop Frozen Bloons.
~ BTD6 description

Oversize Nails is the 1st upgrade of Path 3 for the Engineer Monkey in BTD6. It corresponds to the 9-Inch Nails upgrade from the BTD5 generation. It increases the pierce of the main Engineer's nailgun nails from 3 to 8, and allows them to pop Frozen Bloons.

It costs $380 on Easy, $450 on Medium, $485 on Hard, and $540 on Impoppable.


  • It makes useful early-game pierce akin to a Spike-O-Pult with nearly double attack speed but with nearly 1/3 pierce.
  • When further upgraded along Path 3, particularly with Double Gun, it is quite reliable at stalling early-game bloons.
    • This makes it the best early game Engineer Monkey.
  • Oversized Nails is one of the few sharp projectile towers that can pair well with Ice Shards for the activation of multiple ice shards.



  • It is not known why "Oversized Nails" no longer used the name "9-Inch Nails".
  • The upgrade icon for Oversize Nails is a frozen Red Bloon penetrated by three nails.
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