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Monkey Engineer

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Monkey Engineer
Monkey Engineer Icon
Good at building stuff, the Engineer shoots bloons with a powerful nail gun, and has many useful upgrades that create traps, sentries and other enhancements.
Appearances Bloons TD 5 Deluxe
Bloons TD 5 Mobile
Bloons TD Battles iOS
Bloons Monkey City
Range Short (upgradable without external towers)
Attack Speed Fast
(Approx. 1.4 times per sec)
Cost $380 (Easy)
$450 (Medium)
$485 (Hard)
$540 (Impoppable)
Special Abilities Overclock
Specialty Building Engineer's Workshop
Hotkey L

Monkey Engineer is a monkey tower in Bloons Tower Defense 5 Deluxe, Bloons Tower Defense Battles Mobile, Bloons Tower Defense 5 Mobile, and Bloons Monkey City. It wields a nail gun that shoots at a quick speed, popping three bloons per shot. With upgrades, the Monkey Engineer can spawn sentries, greatly assisting with popping power. This tower, in high numbers and with monkey villages, is easily the best and most cost effective tower in the game by far.

An update on Bloons Monkey City on 15th October 2014 allowed Monkey Engineers to be unlocked with a lv.5 or more 2nd city


Monkey Engineer

Path 1Edit

Easy Medium Hard Impoppable

Sentry Gun
Automatically creates sentry guns and deploys them on the ground nearby. Sentries shoot sharp steel pins at the bloons but only last a short time.

$425 $500 $540 $600

Fast Engineering
Engineer increases his build speed, producing sentry guns more often

$340 $400 $430 $480

Cleansing Foam
Engineer uses a special dispenser to spray down the track with a cleansing foam that removes camo and regen properties. Also pops lead bloons.

$680 $800 $865 $960

Bloon Trap

Creates a powerful bloon trap that destroys all the bloons caught in it. Once full, trap will destroy itself after a short time. If emptied manually, gives you extra cash. Only one trap can be active at a time.

$2975 $3500 $3780 $4200
Total Sell Amount $3844 $4520 $4880 $5424
Total Cost $4805 $5650 $6100 $6780

Path 2Edit

Easy Medium Hard Impoppable

9-Inch Nails
Engineer's nailgun upgrades to shoot massive 9-inch nails that can pop 8 bloons at once including frozen bloons (does not affect sentries)

$385 $450 $485 $540

Larger Service Area
Engineer can shoot further and deploy sentries in a larger area.

$555 $650 $700 $780

Adding sprockets to sentries and the nailgun increase their fire rate appreciably.

$470 $550 $595 $660

Activated Ability: Overclock - target tower becomes super powered for 60 seconds

$11475 $13500 $14580 $16200
Total Sell Amount $10616 $12480 $13476 $14976
Total Cost $13270 $15600 $16845 $18720



  • The Monkey Engineer was added in the Bloons Tower Defense 5 Mobile 1.3 update, along with a new track.
  • on BMC, the 9 inch nails upgrade costs $700 but in the other games, it costs $450
  • This tower can be upgraded to use Sentry Turrets (That randomly spawn within his range) and use a Soap Dispenser to spawn foam that removes camo and pops lead. The Sentry Turrets and Dispensers are most likely references to the game Team Fortress 2.
    • The tower itself may also be a reference to the Engineer class in Team Fortress 2, and with the blue colours from the second upgrade on path 1, the Monkey itself resembles a BLU Team Engineer from Team Fortress 2.
    • The icon for a 1/0 Monkey Engineer also seems to be a reference to Team Fortress 2, as its icon is the engineer hollering and striking a sentry violently with a wrench.
    • Probably to avoid either a bad pun or seeming too much like Team Fortress 2, the engineer does not wield a Monkey Wrench, but rather a crescent wrench.
    • The first upgrade in path 2 is a reference to the industrial band, Nine Inch Nails.
  • A Monkey Engineer with Cleansing Foam doesn't aim with his gun, so the foam can come from behind the monkey.
  • There is a glitch with Sentry Turrets that allows them to be placed on the road or in places that towers can't normally be placed in, if there is no more space to deploy sentries.
  • Sentries can also spawn atop water if there is no other space on land.
  • This tower with the Cleansing Foam upgrade (besides the Monkey Sub's: Bloontonium everlasting ability) is the only tower that makes Regrowth Bloons lose their regen status.
  • A Support Chinook can move Sentries.
  • The tank for the Cleansing Foam is the same as the tank a Glue Gunner has with the Glue Striker upgrade.
  • Spamming 2-2 or 2-3 Engineers while their third tier Specialty Building is activated can beat every single track on Easy, including the Extreme Tracks, if some are influenced by a 2-2 Monkey Village.
  • This is the recommended tower to use in the special mission Full House, as it will deploy sentries when there can be no more towers placed, allowing the player to bypass the maximum amount of towers. This also applies to Random Missions where the Monkey Engineer is available.
  • In Bloons TD 5 Deluxe, a glitch may occur; if an engineer cannot shoot a bloon before the bloon is popped, the engineer may shoot in the direction it is facing without changing direction.
  • Another BTD5 Deluxe glitch involves clicking on a Sentry Gun blanking the artwork. Also, the Go button never shows up and the game cannot continue.
  • The engineer actually has his artwork wrong; when you upgrade the Monkey Engineer to X-2, the icon next to his pop count will appear with the grayish hat for an X-3 Engineer. When you upgrade to X-3, the icon will appear with the red hat for an X-2 Engineer.
  • If the player sells the engineer, his guns would be gone instantly after selling the engineer.
    • However, any Cleansing Foam from the engineer will remain its full duration.
  • In BTD5 Mobile, a 1-4 Engineer will look like a 0-0 Engineer with the yellow uniform and no wrench, but a 0-4 and 2-4 Engineer will have the grey uniform and the wrench.
  • The Engineer and the Spike Factory both use sprockets in their upgrade descriptions.
  • Sometimes when an engineer runs out of space for sentries in Space Truckin, the sentries will be deployed in space; however, they will not be deployed on the path though.
  • In Bloons Monkey City Mobile, there is a special mission where you must rescue 5 Monkey Engineers by paying $450 each. If a bloon touches one Engineer, you'll lose it. The objective is to rescue at least one Engineer and beat all the rounds in order to unlock it in the player's city.

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