Oversize Nails

"Massivization allows nails to pop 8 Bloons at once, including frozen. Also increases Foam and Sentry effectiveness."

- In-game description

 is the 1st upgrade of Path 3 for the Engineer Monkey in Bloons TD 6. 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. Unlike BTD5, this upgrade now also affects Sentry Guns, which now gives the Engineer's sentries +1 pierce and the Shatter damage type (which pops frozen). It also increases Cleansing Foam pierce by +5.

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

Summary
Oversize Nails improves overall pierce for the Engineer Monkey and allows the Engineer and his sentries to pop Frozen Bloons. This is most useful with countering grouped bloons, more specifically in the early-game, or to improve sentry performance later on.

Tips

 * It makes useful early-game pierce akin to a Spike-O-Pult with greater attack speed but with significantly less 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.
 * Oversize Nails is one of the few sharp projectile towers that can pair well with Ice Shards for the activation of multiple ice shards.

Trivia

 * In BTD5, a similar upgrade to this one was called 9-Inch Nails.