Sentry Expert (Battles 2)

For the upgrade in Bloons TD 6, see Sentry Expert (BTD6).

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Sentry Expert

Sentries deploy with different damage types based on your need.

Tower	Engineer Monkey — Path 1 — Tier 4
Cost	$3,250

← Sprockets

Sentry Champion →

Sentry Expert is the Engineer Monkey's path 1 tier 4 upgrade in Bloons TD Battles 2. It produces four different types of Sentries that each have a different attack. It can spawn Crushing Sentries, Boom Sentries, Cold Sentries, and Energy Sentries, and it spawns them in that order by default, but it can prioritize or skip Sentries depending on what Bloons are currently on-screen.

When first upgraded to Sentry Expert, it instantly spawns four of these Sentries around its range.

Costs and sell values

Tiers	Cost	Sell value
4-0-0	$4,900	$3,430
4-1-0	$5,150	$3,605
4-2-0	$5,500	$3,850
4-0-1	$5,350	$3,745
4-0-2	$5,550	$3,885

Strategy

This section was last updated for: version 4.13

Sentry Expert is effective at acting reactively against Bloon rushes and early MOAB rushes, making it stand out between rounds 11-19. The specialized sentries are often enough to take down most rushes after the initial burst of sentry production, and Sentry Expert stabilizes with a full army of normally produced sentries by the end of the burst. However, against round 11, it can be a significant money investment for Engineer-based defenses to buy Sentry Expert for that round, due to needing to buy it and camo detection to compensate for the latter weakness.

4-0-1 and 4-0-2 are generally preferred for the pierce bonus, as these upgrades allow the Sentry Expert to take down rushes more reliably.

Update history

For a complete list of Engineer Monkey changes, see Update history:Engineer Monkey (Battles 2).

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Version 1.0.4

4-0-2

•  Sentries can no longer stun Ceramics (bug fix)

Version 4.1

“

Recently, we altered Overclock so that buffing a parent tower will also buff all of its child towers (eg sentries). Additionally, in this update we’re fixing a bug with this, meaning that newly spawned child towers will now correctly inherit the buff. With these changes, it makes Sentry Champion incredibly strong but only when buffed up a lot by the likes of Homeland Defense and Overclock. We have decided to change Engineer so that the spawn rate of its sentries can no longer be affected by attack rate buffs, but we have also greatly increased Sentry Champion’s regular damage so that it’s much stronger on its own now.
— Update notes

”

•  Sentry: no longer affected by attack speed buffs

Version 4.4

“

The Engineer has been languishing at the bottom of the “most used towers” list for a while. This change makes the sentry expert more useful immediately since it no longer needs to wait to generate its special sentry towers, and also opens up some interesting micro opportunities.
— Update notes

”

•  Now immediately spawns 6 Sentries when the upgrade is purchased

Version 4.8

“

We want Sentry Expert to have a big impact the moment you purchase it so feel it's important to keep the bonus sentries it spawns. 6 bonus sentries were proving to be too much extra damage however so we are dialing it back to 4 to make it a more measured response to a rush.
— Update notes

”

•  Sentries spawned upon upgrading reduced ― 6 → 4

Version 4.13

“

Sentry Expert is proving too cost-effective as a reactive response to a rush.
— Update notes

”

•  Upgrade cost increased ― $2,800 → $3,250

Gallery

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

Screenshots

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Assets

• 
  Portrait
• 
  Crushing Sentry portrait
• 
  Boom Sentry portrait
• 
  Energy Sentry portrait
• 
  Cold Sentry portrait
• 
  Upgrade icon

In other languages

Language	Name / Description	Notes
Danish	Sensorekspert Sensormaskingeværer indsættes med forskellige skadetyper baseret på dine behov.	—
German	Wachenexperte Wachtürme werden mit verschiedenen Schadensarten eingesetzt – basierend auf deinen Bedürfnissen.	—
Spanish	Centinela experto Los centinelas se despliegan con diferentes tipos de daño según tu necesidad.	—
Finnish	Vartioinnin asiantuntija Vartiotykit käyttävät erilaisia vahinkotyyppejä tarpeidesi mukaan.	—
French	Sentinelle experte Les sentinelles sont déployées avec différents types de dégâts selon tes besoins.	—
Italian	Sentinella esperta Le sentinelle vengono schierate con diversi tipi di danno in base alle tue esigenze.	—
Japanese	見張りエキスパート 見張り番が、必要に応じて異なる種類のダメージを備えて展開する。	—
Korean	경비 전문가 필요에 따라 다른 공격 유형의 경비 포탑을 배치할 수 있습니다.	—
Dutch	Wachtersexpert Wachters worden op basis van jouw vereisten met verschillende soorten schades uitgerust.	—
Norwegian	Tårnekspert Soldater utplasseres med forskjellige skadetyper etter dine behov.	—
Portuguese (Brazil)	Especialista em Torres Sentinelas são montadas com diferentes tipos de dano de acordo com sua necessidade.	—
Russian	Эксперт по турелям Выставляются турели с различными видами урона, в зависимости от ваших потребностей.	—
Swedish	Vakttornsexpert Vaktkulsprutorna placeras ut med olika skadetyper, beroende på dina behov.	—
Turkish	Gözcü Uzmanı Gözcüler ihtiyacına göre farklı hasar türleriyle görevlidir.	—
Chinese (traditional)	岗哨專家 根據你的需要，哨兵部署不同的傷害類型。	—
Last updated: version 4.0.1