Sentry Gun (BTD6)

Overview

BTD5

BTD6

BTDB2

Sentry Gun

General Information

Game

Bloons TD 6

Tower

Engineer Monkey

Unlocked at

160 XP

Cost

$425 (Easy)
$500 (Medium)
$540 (Hard)
$600 (Impoppable)

Activated Ability

N/A

Targeting Options

First, Last,
Close, Strong

Camo Detection

No

Popology

Damage Type(s)

Sharp

Single Projectile

Straight Attack

Other(s)

Sentry Deployment:

Passive

Deploy Sub-Tower

Sentry Nails:

Sharp

Single Projectile

Straight Attack

Statistics

Damage

1 (nail and sentries)

Pierce

3 (nail, e.a.u.)
2 (sentry, e.a.u.)

Attack Speed

Moderately Fast (nail, every 0.70s)
Moderate (sentry, every 0.95s)
Extremely Slow (sentry deploy, every 10.0s)

Range

40 (nail and sentry deployment, e.a.u.)
45 (sentry, e.a.u.)

Status Effects

N/A

Tower Boosts

N/A

Income/Life Boosts

N/A

Path Upgrades

Current

Next →

Sentry Gun

Faster Engineering

Path Info

Path

Upgrade Tier

1

[Source]

“	Creates temporary sentry guns and deploys them nearby.	”
	^{~ In-game description}

Sentry Gun is the first upgrade of path 1 for the Engineer Monkey in Bloons TD 6. It gains an additional build sentry attack, allowing it to create sentry gun sub-towers within its range every 10 seconds. Each sentry lasts for 25 seconds (30 seconds with Vigilant Sentries MK), meaning on average up to between 2 to 3 sentries from the same Engineer may be active at a time. The sentry-building attack is affected by attack speed buffs such as Jungle Drums and Berserker Brew. Sentries always attempt to spawn within 20% of their range to the track. Overclock and Ultraboost cannot target sentries.

This upgrade costs $425 on Easy, $500 on Medium, $540 on Hard, and $600 on Impoppable.

Description[]

Overview[]

Not enough images!
There are not enough images on this page to sufficiently complete this page or section. You can help by uploading some images related to the article's subject(s).

Engineers with the Sentry Gun upgrade receive green-colored nailguns and a wrench. The wrench is a combination wrench colored dark grey with one light grey marking at the jaws and two light grey markings at the end. Most Engineers with the Sentry Gun crosspath hold the wrench in their left hand, while Double Gun and Bloon Trap hold them on their backs. Engineers creating sentries use a unique deployment animation.

The Sentry Gun upgrade adds a build sentry attack, allowing it to deploy sentries that each deal 1 damage and shots that pierce up to 2 bloons every 0.95s. The Engineer deploys sentries every 10 seconds. Sentries last for up to 25 seconds by default, by default having up to 2-3 sentries at once. Sentries at this tier can be upgraded further along this path to enhance the power of sentries, or with certain crosspaths that further enhance its power. Specifically applies to Oversize Nails (+1 pierce and frozen-popping), Larger Service Area (+4 range), Deconstruction (+1 MOAB and +1 Fortified damage), and Cleansing Foam (shots act like Cleansing Foam).

Targeting Priorities[]

Faster Engineering targets bloons using the standard targeting priorities. Its main attack shoots straight movement projectiles.

First: Targets the first bloon visible within its range.
Last: Targets the last bloon visible within its range.
Close: Targets the closest bloon visible within its range.
Strong: Targets the strongest bloon visible within its range.

Faster Engineering, like all Engineers with Path 1 upgrades, can deploy sub-towers called sentries, targeting them such that they prioritize unoccupied land. Newly spawned sentries inherit the parent Engineer's targeting priorities, and also shoot straight movement projectiles. Targeting priority for all sentries use standard targeting priorities (First, Last, Close, Strong) and can be changed at any time.

Costs[]

Updated as of Version 50.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.

[Module \| Data]	Purchase				Sell
Costs	Easy	Medium	Hard	Impoppable	Easy	Medium	Hard	Impoppable
Upgrade (1-X-X)	$425	$500	$540	$600	-
Total (1-0-0)	$720	$850	$920	$1,020	$504	$595	$644	$714
Crosspath (1-1-0)	$930	$1,100	$1,190	$1,320	$651	$770	$833	$924
Crosspath (1-2-0)	$1,225	$1,450	$1,570	$1,740	$858	$1,015	$1,099	$1,218
Crosspath (1-0-1)	$1,100	$1,300	$1,405	$1,560	$770	$910	$984	$1,092
Crosspath (1-0-2)	$1,285	$1,520	$1,640	$1,825	$900	$1,064	$1,148	$1,278

This upgrade's prices (or included crosspath's prices) are affected by the following MK: Better Sell Deals

Type of Sentry[]

Nail Sentry[]

Nail Sentry, referred in-game as "Sentry", is an green-colored automatic sentry that shoots nails. It shoot nails every 0.95 seconds, and each nail can pop 2 bloons (3 with Oversize Nails) and they have a range of 45 (+4 with Larger Service Area). The nails Sharp type and cannot pop lead or frozen without special upgrades or supports. Crosspathing with Oversize Nails changes the Sentry's damage type from Sharp to Shatter, allowing them to pop Frozen Bloons.

Damage Type: Sharp
Damage: 1
Pierce: 2 (3 with 1-0-1)
Attack Speed: 1.05x (every 0.95s)

Strategy[]

Summary[]

Sentry Gun is traditionally the main feature of the Engineer that gives it the edge at early-game, and it remains true in BTD6. In essence, the Sentry Gun upgrade provides the Engineer with an attack that allows it to deploy nearly statistically equivalent 0-0-1 Dart Monkeys nearby. These sentries provide the Engineer with considerable early-game damage, especially while combined with the fair attack speed and pierce of the base Engineer itself.

Unlike their BTD5 counterpart, sentries do not have footprint that blocks placement of towers. Therefore, towers can be placed freely nearby sentry spots without getting confronted with occupied placement of sentries. On that other note, sentry spots conversely become blocked from being placed on top of existing towers, unless in the extreme case where almost all available land space becomes unavailable where these sentries will only spawn onto bare crevices between towers. Such interactions can be used to deliberately alter where the Engineer can place sentries.

Tips[]

Sentries spawned from the Engineer will automatically be set to whatever the Engineer's target priority is. They can also be manually changed to a specific target priority.
While the Sentry Gun upgrade helps bolster popping power for the Engineer, the player should upgrade further to Faster Engineering for further DPS, as increasing the production speed further is far more effective than just the range or pierce crosspathing in most situations.
Note that adding Sentry Gun effectively increases the attack range coverage of the Engineer Monkey somewhat, although this is dependent on where the Engineer's sentries land.

Version History[]

Balance Changes[]

When first released, sentries had very little popping power, especially in relation to 0-0-0 Dart Monkeys, which now have 2 pierce instead of 1. The base sentry pierce was increased back to the BTD5 amount to compete with the value of 0-0-0 Dart Monkeys. Additionally, Sentries now have crosspathing benefits in later updates.

12.0 (compared to BTD5)

Pierce of Sentry Gun decreased (2 → 1).

12.1

[Bug Fix] 110 Larger Service Area now increases Sentry deploy range.
[Bug Fix] Fixed a bug where Bloon Trap granted camo detection and lead poppage to sentries.

15.0

Standard Sentry pierce increased from 1 to 2.

17.0

[Bug Fix] 1xx Sentry Gun sentries no longer gain camo detection when a save is loaded.
[Bug Fix] 1xx Sentry Gun sentry placement will no longer ignore 'smart placement' if the Engineer cannot reach the track.

20.0

“	Continuing our efforts to make crosspaths meaningful and fit the style of each path more solidly, a number of crosspath and base level balance shifts were made.	”
	^{~ Ninja Kiwi}

110 Larger Service Area now applies 1/5th the range (+4) to any sentries produced.
101 Oversize Nails allows sentries produced by this tower to pop frozen Bloons.
101 Oversize Nails now increases sentry pierce by +1.

23.0

120 Deconstruction now applies to sentries.

31.0

130 Cleansing Foam now applies to sentries.

33.0

“	The MOAB offense of top path lacks for a mainly dps tower that is quite complex to use, T3 Sprockets already feels underwhelming so is seeing a buff here carrying up to T4, and the 320 crosspath will now be able to double dip on the Fortified & MOAB damage bonuses that it gains. [...]	”
	^{~ Ninja Kiwi}

1-2-0 Sentries' Deconstruction bonuses to Fortified and MOAB-class are no longer mutually exclusive

43.0

“	[...] Sentry placements are slightly changing to improve their reliability, and will now spawn closer to the track depending on how much range the sentry has. [...]	”
	^{~ Ninja Kiwi}

Sentries now spawn within 20% of their range to the track

47.0

“	This was becoming annoying screen clutter with large numbers of sentries, and feels unnecessary when you can overclock the engineer itself to create more sentries instead.	”
	^{~ Ninja Kiwi}

Sentries can no longer be targeted for Overclock or Ultraboost
- Overall buff due to avoiding accidental targeting of sentries in the clutter

Bug Fixes and General Changes[]

This section is incomplete. You can help by expanding it.

Extra Notes (Version History)[]

Sounds[]

When a sentry is placed:

Gallery[]

Official artwork[]

Trivia[]

Before the sentry pierce buff in Version 15.0, Sentries were the slowest one-projectile towers to have only one pierce, excluding Sniper Monkeys (their bullets are too fast to be visibly moving in-game).