Engineer Monkey (BTD6)

"Holds a trusty nail-gun to pop the Bloons. Can upgrade to create its own nail-shooting sentry turrets."

- In-game Description

The Engineer Monkey is a Support-class tower that arrived in the 12.0 update of Bloons TD 6 on September 17, 2019. The tower received a name-change from Monkey Engineer, but retains its role from the Bloons TD 5 Generation, with significant additions.

It was first teased on social media (specifically on Twitter and Reddit) just before Version 12.0 was released several days later. On Reddit, it was teased here, on September 15th 2019.

Engineer Monkey wields a nailgun that shoots nails at bloons. He shoots one nail every 0.70s, and each nail pierces up to 3 bloons. Engineer starts with a base range of 40. The main power of the Engineer comes from contraptions and other applications of mechanical engineering. He can be upgraded to produce sentries of various types, Cleansing Foam, and Bloon Traps. He can also be upgraded to boost other towers by the use of a power wrench, amplifying the attack speed of its targets with Overclock.

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

Description
The Engineer Monkey features his yellow hard hat as he did back as Monkey Engineer in BTD5. His nailgun is smaller than his BTD5 counterpart, and is colored yellow. Because of the nailgun's smaller size, he only needs to hold it with just his right hand instead of with both hands.

Path 1 focuses on damage and deployment of Sentries. It allows Engineer to build secondary towers as decent backup defense, with further upgrades increasing their effectivity. Sentry Expert allowing the build of Specialized sentries to add versatile support against certain bloons. Its 5th tier Sentry Champion allows building of very powerful unstable sentries that before disappearing explode (Dealing huge damage to nearby bloons.

Path 2 focuses on support. Larger service area allows the engineer to shoot from a longer range, while Deconstruction improves MOAB and Fortified damage. Cleansing Foam removes Camo and Regrow properties off bloons, Overclock allows monkey engineer to temporarily increase attack speed of targeted tower by 66%. (Duration varies by tier of tower) (For banana farms it increases income and for villages it increases influence radius)., Ultraboost adds permanent 6,6% to overclocked tower that stacks up to 10x for maximum of 66% permanent increase.

Path 3 focuses on a combination between stalling and cleanup. its Pin upgrade allows monkey engineer to pin any Non Moab class, ceramic, lead. Temporarily stopping it from progressing for short time. Bloon Trap allows any non-moab class bloon to be trapped until full which can be manually collected (with some bonus cash). Its 5th tier XXXL Bloon Trap significantly increases the capacity and can also trap Moab class bloons (Excluding B.A.D).

Target Priorities
The base Engineer Monkey uses the standard target priorities: First, Last, Close, Strong. Most of the Engineer's alternate attacks do not integrate its own target priority.

All of the Engineer Monkey's alternate attacks have a different set of target priorities:
 * Sentry spawning tends to follow based on the Engineer's perception of where bloons will most likely move around. Hence, sentry spawning depends slightly on RNG but is not entirely RNG-based. Sentry spawns also attempt to only target unoccupied areas of the map. If there are many towers within range of the Engineer blocking potential land spots, the Engineer will spawn sentries between the space of other towers.
 * Sentries themselves start with the target priority of the main Engineer at the time of spawning. Individual sentries must have their target priority changed manually from their current target priority.
 * Cleansing Foam location is able to be chosen by the player. Foam is placed on Close by default.
 * Overclock and Ultraboost abilities require user input to pick the tower to boost.
 * Bloon Traps and XXXL Traps are always placed on Close regardless of the Engineer's own target priority, unless larger service area is bought, because if it is, the player may choose a place in range of the engineer to place it.

Total Costs
Note: these numbers refer to Medium Mode.

Monkey Knowledge
This section displays Monkey Knowledge that has effects on Engineer Monkey and its changes when compared to one by default:
 * VigilantSentriesIcon.png Vigilant Sentries: Sentry Turrets last longer than normal.
 * Increases Sentry Gun lifespan from 25 seconds to 30 seconds. Applies to all Sentries, including from Sentry Expert and Sentry Champion.
 * MonkeyEducationIcon.png Monkey Education: All Monkeys XP earn rate increased by 8%.
 * ThickerFoamsIcon.png Thicker Foams: Cleansing Foam can hit 3 more Bloons before expiring.
 * Increases pierce of each base cleansing foam blob from 10 to 13.
 * With Oversize Nails, cleansing foam blobs increase pierce from 15 to 18.
 * BetterSellDealsIcon.png Better Sell Deals: All Monkeys sell for 5% more.
 * Increases sell potency from 70% to 75%.
 * BigTrapsIcon.png Big Traps: Bloon Trap can hold up to 530 RBE.
 * VeteranMonkeyTrainingIcon.png Veteran Monkey Training: All Monkeys reload time reduced by 3%.
 * GlobalAbilityCooldownsIcon.png Global Ability Cooldowns: All Ability cooldowns for all Monkeys reduced by 3%.

Teaser
It was teased a few days earlier on Reddit, on September 15th 2019. Other teasers posted on Ninja Kiwi's Twitter on here and here tease the Engineer Monkey.

Videos
TBA

Trivia

 * The tower itself is a reference to the Engineer class in Team Fortress 2.
 * The engineer appears as the icon for Support towers in the Monkey Knowledge screen in BTD6 meaning it was most likely intended to be a launch tower but was not finished in the time frame they wanted to release the game in.
 * The engineer was eventually released in the 12.0 update with a different artwork than the Monkey Knowledge icon.
 * In BTD6, this was the only tower where all of its tier 2 upgrades cost less than its tier 1 upgrades.
 * This is no longer true as of the 21.0 update, since Deconstruction now costs more than Larger Service Area.
 * Sentries inside the range of a Monkey Village will have the effects of it, regardless of whether the Engineer that spawned them is inside the range of the Monkey Village.
 * Overclock is the only Tier 4 Engineer Monkey to lack any form of eyewear. Sentry Expert wears experimental goggles, while Bloon Trap wears a pair of yellow tinted sunglasses.
 * Sentry Champion formerly had the name 'Sentry Paragon', but was renamed to avoid confusion with the later added Paragons.
 * According to Ninja Kiwi's October 29th 2021 blog, Engineer Monkeys trying to hit Paragon Sentries (referred as "sentry champion [sic]"  in the blog) to speed them up causes these sentries to explode. Since then, Engineer Monkeys never hit their sentries ever again. Because hitting sentries to speed them up is a Team Fortress 2 reference, it can be implied that Engineer Monkeys use wrenches to hit their sentries.
 * Each Engineer Monkey path corresponds roughly to a different engineering discipline. Path 1 themes around systems engineering, which involves designing and managing complex systems. Path 2 themes around chemical engineering, which involves implementing and optimizing processes in systems. Path 3 themes around mechanical engineering, which involves designing and creating mechanical systems.