Sentry Gun (BTD6)

For other uses, see Sentry Gun (disambiguation).

Sentry Gun

	Creates temporary sentry guns and deploys them close to track anywhere in radius.

Tower		Path	Tier
Engineer Monkey		1	1

XP cost	160
Cash cost	$425 — Easy $500 — Medium $540 — Hard $600 — Impoppable

Faster Engineering →

Sentry Gun is the Engineer Monkey's path 1 tier 1 upgrade in Bloons TD 6. With this upgrade, the Engineer can deploy Sentry sub-towers within its range to pop Bloons. It deploys a Sentry every 10 seconds and each one lasts for 25 seconds (30 seconds with Vigilant Sentries). If possible, an Engineer will spawn Sentries at locations where the range of its Sentries can cover at least 20% of the track. By default, Sentries attack every 0.95s, pop up to 2 Bloons, and have 45 range.

Crosspaths will affect newly spawned sentries.

• Larger Service Area: +4 range, for a total of 49.
• Deconstruction: Sentries deal +1 damage to Fortified and +1 damage to MOAB-Class Bloons.
• Cleansing Foam: Sentries can cleanse Bloons they hit, but will not grant damage to DDTs or shielded Dreadbloon.
• Oversize Nails: +1 pierce, for a total of 3, and changes the damage type from Sharp to Shatter, allowing for the popping of frozen Bloons.
• Double Gun: Sentries shoot two projectiles per shot.

Stats

For a complete list of Engineer Monkey stats, see Stats:Engineer Monkey (BTD6).

This data was last updated for: version 55.1

Tower
Display range 40 units Footprint radius 7 units Targeting options First Last Close Strong

Attack
Cooldown 0.7s Offset (X, Y, Z) -1.11, 13.49, 10.7 Targeting Depends on targeting option Targeting range 40 units Filters Cannot target Camo
Projectile Pierce 3 Damage 1 Damage type Sharp Speed 375 units/s Lifespan 0.24s Radius 2 units Filters Cannot hit Camo

Spawner
Cooldown 10s Offset (X, Y, Z) -1.11, 13.49, 10.7 Targeting Random position Targeting range 40 units
Ignores blockers

Sentry

Tower
Display range 45 units Footprint radius 4 units Lifespan 25s Targeting options First Last Close Strong

Attack
Cooldown 0.95s Offset (X, Y, Z) 0, 7.1, 7.78 Targeting Depends on targeting option Targeting range 45 units Filters Cannot target Camo
Projectile Pierce 2 Damage 1 Damage type Sharp Speed 300 units/s Lifespan 0.25s Radius 2 units Filters Cannot hit Camo

1-1-0

Tower
Display range 40 units → 60 units

Attack
Targeting range 40 units → 60 units

Spawner
Targeting range 40 units → 60 units

Sentry

Tower
Display range 45 units → 49 units

Attack
Targeting range 45 units → 49 units

1-0-1

Attack
Projectile Pierce 3 → 8 Damage type Sharp → Shatter

Sentry

Attack
Projectile Pierce 2 → 3 Damage type Sharp → Shatter

Costs and sell values

Note: this list does not factor in Monkey Knowledge or other discounts.

Tiers	Total cost				Sell value
	Easy	Medium	Hard	Impoppable	Easy	Medium	Hard	Impoppable
1-0-0	$725	$850	$920	$1,020	$508	$595	$644	$714
1-1-0	$935	$1,100	$1,190	$1,320	$655	$770	$833	$924
1-2-0	$1,230	$1,450	$1,570	$1,740	$861	$1,015	$1,099	$1,218
1-3-0	$1,995	$2,350	$2,540	$2,820	$1,397	$1,645	$1,778	$1,974
1-4-0	$13,470	$15,850	$17,120	$19,020	$9,429	$11,095	$11,984	$13,314
1-5-0	$74,670	$87,850	$94,880	$105,420	$52,269	$61,495	$66,416	$73,794
1-0-1	$1,105	$1,300	$1,405	$1,560	$774	$910	$984	$1,092
1-0-2	$1,290	$1,520	$1,640	$1,825	$903	$1,064	$1,148	$1,278
1-0-3	$1,670	$1,970	$2,125	$2,365	$1,169	$1,379	$1,488	$1,656
1-0-4	$4,730	$5,570	$6,015	$6,685	$3,311	$3,899	$4,211	$4,680
1-0-5	$42,980	$50,570	$54,615	$60,685	$30,086	$35,399	$38,231	$42,480

Strategy

This section was last updated for: version 51.2

Sentry Gun is a fairly cheap early-game option that works well on maps where the multiple low-pierce sentries can concentrate within a compact area. Despite its wide deployment range, Sentry Gun is not efficient on maps where sentries cover many separated track areas, due to its somewhat erratic sentry spawns. Time is needed to create its maximum amount of sentries, for (assuming no buffs) up to two to three at a time, or three with Vigilant Sentries. Its cost is steeper than other early-game options, however it stands out on maps like Workshop that struggle to fit multiple 0-0-0 Dart Monkeys. Boomerang is preferred if Sentry Gun already pierce-caps often.

1-0-1 is an efficient crosspath for pierce of itself and sentries. 1-2-0 can be useful for extra MOAB damage, however the increased deployment area of 1-1-0 can be harmful due to spreading the sentry spawns.

Update history

For a complete list of Engineer Monkey changes, see Update history:Engineer Monkey (BTD6).

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Version 15.0

•  Sentry: pierce increased ― 1 → 2

Version 17.0

•  Sentry: No longer gains Camo detection after loading a save (bug fix)
•  Sentry spawner: No longer ignores smart placement if the Engineer Monkey cannot reach the track (bug fix)

Version 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. — Update notes

”

1-1-0, 1-2-0, 1-3-0, 1-4-0, 1-5-0

•  Larger Service Area crosspath now increases Sentry range by +4

1-0-1, 1-0-2, 1-0-3, 1-0-4, 1-0-5

•  Oversize Nails crosspath now allows Sentries to pop frozen Bloons
•  Oversize Nails crosspath now increases Sentry pierce by 1

Version 23.0

1-2-0, 1-3-0, 1-4-0, 1-5-0

•  Deconstruction: now grants all Sentries +1 damage to Fortified & MOAB

Version 29.0

•  Overall cost reduced by $50 (due to cost changes for previous tiers)

Version 31.0

1-3-0, 1-4-0, 1-5-0

•  Foam makes Sentries shoot Foamy nails that strip properties

Version 33.0

“

The MOAB offense of top path lacks for a mainly dps tower that is quite complex to use [...] the 320 crosspath will now be able to double dip on the Fortified & MOAB damage bonuses that it gains. — Update notes

”

1-2-0, 1-3-0, 1-4-0, 1-5-0

•  Sentry: Deconstruction's bonus damage to MOAB-Class Bloons and Fortified Bloons are no longer mutually exclusive

Version 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. — Update notes

”

•  Overall cost reduced by $50 (due to cost changes for previous tiers)
•  Sentry deployment: Sentries now spawn within 20% of their range to the track

Version 46.0

“

Middle crosspath feels too good for Bloontraps because of the massive quality of life it brings, so we’re pushing the DPS more for top crosspath by allowing Double Gun to also double the projectiles of Sentries. — Update notes

”

1-0-3, 1-0-4, 1-0-5

•  Double Gun Sentries now shoot two projectiles at once

Version 46.2

1-0-3, 1-0-4, 1-0-5

•  Sentry: Double Guns upgrade no longer reduces their pierce ― 2 → 3 (bug fix)

Version 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. — Update notes

”

•  Overclock and Ultraboost abilities no longer target Engineer sentries

Version 49.0

•  Description changed ― Creates temporary sentry guns and deploys them nearby. → Creates temporary sentry guns and deploys them close to track anywhere in radius.

Gallery

For more Engineer Monkey images, see Gallery:Engineer Monkey.

Screenshots

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Assets

• 
  Portrait
• 
  Sentry portrait
• 
  Upgrade icon
• 
  Insta Monkey icon

Models

• 
  Sentry

In other languages

Language	Name / Description	Notes
Arabic	بندقية الحراسة صنع بنادق حراسة مؤقتة ونشرها في مكان قريب.	—
Danish	Sensormaskingevær Skaber midlertidige sensormaskingeværer og indsætter dem i nærheden.	—
German	Wachkanone Fertigt zeitlich begrenzte Überwachungskanonen und startet sie in seiner Nähe.	—
Spanish	Arma centinela Crea armas centinelas temporales y las despliega cerca.	—
Spanish (LA)	Arma centinela Crea armas centinelas temporales y las despliega cerca.	—
Finnish	Vartiomiehen kivääri Luo väliaikaisia vartiotykkejä ja asettaa ne lähelle.	—
French	Pistolet de sentinelle Crée des pistolets de sentinelle temporaires et les déploie à proximité.	—
Italian	Cannone sentinella Crea cannoni sentinella temporanei e schierali nelle vicinanze.	—
Japanese	ガードガン 一時的に見張り番を作り、付近に展開する。	—
Korean	감시 총 임시로 감시 총을 만들고 근처에 배치합니다.	—
Dutch	Geschutskoepel Creëert tijdelijke geschutskoepels en zet ze in de buurt op.	—
Norwegian	Vaktpistol Oppretter midlertidige vaktpistoler og distribuerer dem i nærheten.	—
Polish	Strzelający strażnik Tworzy tymczasowych strzelających strażników i stawia ich w pobliżu.	—
Portuguese (Brazil)	Arma Sentinela Cria temporariamente armas sentinelas e as posiciona por perto.	—
Russian	Турель Строит временные турели и размещает их поблизости.	—
Swedish	Vaktkulspruta Skapar tillfälliga vaktkulsprutor och grupperar dem i närheten.	—
Thai	ป้อนปืนระวังภัย สร้างป้อมปืนระวังภัยชั่วคราว และวางปืนในบริเวณใกล้เคียง	—
Turkish	Gözcü Silah Geçici gözcü silahlar oluşturur ve onları yakında konuşlandırır.	—
Chinese (simplified)	哨兵枪 制造临时岗哨枪并在附近部署。	—
Chinese (traditional)	哨兵槍 製造臨時崗哨槍並在附近部署。	—
This list was last updated for: version 43.1