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{{for|other uses|Sentry Expert (disambiguation)}}
{{for|the upgrade in [[Bloons TD Battles 2]]|Sentry Expert (Battles 2)}}
{{BTD6 upgrade info
{{BTD6 upgrade info
|id=Sentry Expert
|id=Sentry Expert
Line 17: Line 17:
|xp    =9500
|xp    =9500
}}
}}
'''Sentry Expert''' is the [[Engineer Monkey (BTD6)|Engineer Monkey]]'s path 1 tier 4 [[upgrade]] in ''[[Bloons TD 6]]''. It replaces its [[Sentry Gun (BTD6)|Sentries]] with 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.
'''Sentry Expert''' is the [[Engineer Monkey (BTD6)|Engineer Monkey]]'s path 1 tier 4 [[upgrade]] in ''[[Bloons TD 6]]''. <section begin="lede"/>This upgrade replaces its [[Sentry Gun (BTD6)|Sentries]] with 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 and deprioritize each Sentry type depending on what Bloons and Sentries are currently on-screen.<section end="lede"/>


==Sentries==
==Mechanics==
{{research|Sentry spawning algorithm|section=y}}
When an Engineer Monkey with Sentry Expert is about to deploy a Sentry, it determines which type of Sentry to deploy using a scoring system based on the types of Bloons and Sentries on the map at that moment. Only the outer layers of Bloons are taken into consideration, and [[Camo Bloon (BTD6)|Camo Bloon]]s count even if the Engineer Monkey doesn't have [[Camo detection]], though it ignores Bloon types that aren't part of the default roundset (such as [[Boss Bloon]]s and ''[[Frontier Legends]]'' Bloons). Sentries placed by other Sentry Expert Engineer Monkeys affect its scores in the same way as its own Sentries. It calculates the score of each Sentry type in the following steps:
Usually, the Sentry Expert spawns Crushing, Boom, Cold, and Energy Sentries in that order. However, some sentries are skipped if certain Bloons appear on screen, and conversely some sentries are prioritized.
 
#The Sentry type's score changes based on the proportions of Bloons currently on the map (the percentage of Bloons of each type, not the actual amounts). This works by applying a multiplier (positive or negative, depending on the Sentry type) to the proportions of specific Bloon types, then adding those to its score modifiers.
#*For example, Boom Sentry applies 1× score to [[Lead Bloon (BTD6)|Lead Bloon]]s, -1× score to [[Black Bloon (BTD6)|Black Bloon]]s, and -0.5× score to [[MOAB (BTD6)|MOAB]]s; if there are 60 Lead Bloons, 20 Black Bloons, 20 MOABs, and no other Bloons of any type on-screen, Boom Sentry has +0.6 score from Lead Bloons, -0.2 score from Black Bloons, and -0.1 score from MOABs.
#*In this scenario, if there are also 100 [[Purple Bloon (BTD6)|Purple Bloon]]s on-screen, it effectively halves all of these score modifiers, since half of the proportion of Bloons on the map are ones that don't affect the score of Boom Sentry.
#An extra score modifier applies if the Sentry type's special condition is met:
#*Crushing Sentry: +1.5 if there are no Crushing Sentries and at least 15 Ceramics
#*Boom Sentry: +1.5 if there are fewer Boom Sentries than Cold Sentries and at least 20 Pinks
#*Cold Sentry: +1.5 if there are fewer Cold Sentries than Boom Sentries and at least 20 Pinks
#*Energy Sentry: -4 if there are no Crushing Sentries, no Cold Sentries, and at least 10 MOABs
#The base score becomes the average of all the Sentry type's score modifiers, not factoring in Bloons that don't have score multipliers for that Sentry, and only factoring in the special case if its conditions are met.
#*For example, if the Boom Sentry's score modifiers are +0.6 from Leads, -0.2 from Blacks, -0.1 from MOABs, and +1.5 from its special condition, its base score is 0.6. Without the special condition, its base score is 0.1.
#Finally, the base score lowers by 1% per Sentry of that type that currently exists on the map. For example, if Boom Sentry has a base score of 0.6 and there are already three Boom Sentries on the map, its score becomes 0.582.
 
The Sentry with the highest score is chosen. If the highest score is tied, it prioritizes Crushing Sentry, Boom Sentry, Cold Sentry, or Energy Sentry, in that order.


Sentries get the following benefits from [[crosspath]]ing:
===Score modifiers===
*[[Larger Service Area (BTD6)|Larger Service Area]] increases the Sentries' [[range]] by +4.
*[[Deconstruction (BTD6)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon (BTD6)|MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (BTD6)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class).
*[[Oversize Nails (BTD6)|Oversize Nails]] increases the Sentries' [[pierce]] by 50% from the base amount.
*[[Pin (BTD6)|Pin]] allows the Sentries to stun Bloons for 1 second (except the Cold Sentry).
{|class="wikitable"
{|class="wikitable"
!Type
!rowspan="2"|Bloon type
!Prioritized against
!colspan="4"|Score modifiers
!Skipped against
|-
!Crushing
!Boom
!Cold
!Energy
|-
!Pink
|—
|—
|1×
|—
|-
!Black
|—
| -1×
|—
|—
|-
!White
|—
|—
| -1×
|—
|-
!Purple
|1×
|—
|1×
| -1×
|-
!Lead
|—
|1×
| -1×
|—
|-
!Zebra
|—
|—
|—
|1×
|-
!Rainbow
|—
|—
|—
|1×
|-
!Ceramic
|1×
|—
|1×
|—
|-
|-
!Crushing Sentry
!MOAB
|[[Purple Bloon (BTD6)|Purple Bloons]], [[Ceramic Bloon (BTD6)|Ceramic Bloon]]s
|—
|None
| -0.5×
|—
|1×
|-
|-
!Boom Sentry
!BFB
|[[Lead Bloon (BTD6)|Lead Bloon]]s
|—
|[[Black Bloon (BTD6)|Black Bloon]]s
|—
|—
|2×
|-
|-
!Cold Sentry
!ZOMG
|[[Pink Bloon (BTD6)|Pink Bloon]]s
|—
|[[White Bloon (BTD6)|White Bloon]]s
|—
|—
|4.5×
|-
|-
!Energy Sentry
!DDT
|[[Zebra Bloon (BTD6)|Zebra Bloon]]s, [[Rainbow Bloon (BTD6)|Rainbow Bloon]]s, [[MOAB-Class Bloon]]s (including invisible [[DDT (BTD6)|DDT]]s, even though it cannot damage them without support)
|—
|[[Purple Bloon (BTD6)|Purple Bloon]]s
|—
|—
|2.5×
|-
!BAD
|—
|—
|—
|10×
|}
|}
===Takeaways===
*Crushing Sentry gains priority from Purples and Ceramics, and gains extra priority if there are no Crushing Sentries and at least 15 Ceramics.
*Boom Sentry gains priority from Leads, loses priority from Blacks and MOABs, and gains extra priority if there are less Boom Sentries than Cold Sentries and at least 20 Pinks.
*Cold Sentry gains priority from Pinks, Purples, and Ceramics, loses priority from Whites and Leads, and gains extra priority if there are less Cold Sentries than Boom Sentries and at least 20 Pinks.
**Effectively, if there are at least 20 Pinks and there aren't enough other Bloon types for other Sentry types to take priority, it attempts to balance the number of Boom Sentries and Cold Sentries evenly instead of going all-in on Cold Sentries.
*Energy Sentry gains priority from all MOAB-Class Bloons (including DDTs, even if it can't detect them), loses priority from Purples, and loses extra priority if there are at least 10 MOABs and no Crushing Sentries or Cold Sentries.
**Effectively, if there are at least 10 MOABs and not enough other Sentries to handle their Ceramic children, it pre-emptively de-prioritizes Energy Sentries until at least one Crushing Sentry and one Cold Sentry spawn in.
*All Sentry types slightly lose priority relative to how many of them already exist on the map.
*If the highest score is tied, it prioritizes Crushing Sentry, Boom Sentry, Cold Sentry, or Energy Sentry, in that order.
**Because of this and the previous point, if there are no Bloons on-screen that can modify score, it cycles through each Sentry type in order.
==Sentries==
Sentries get the following benefits from [[crosspath]]ing:
*[[Larger Service Area (BTD6)|Larger Service Area]] increases the Sentries' [[range]] by +4.
*[[Deconstruction (BTD6)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon (BTD6)|MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (BTD6)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class).
*[[Oversize Nails (BTD6)|Oversize Nails]] increases the Sentries' [[pierce]] by 50% from the base amount.
*[[Pin (BTD6)|Pin]] allows the Sentries to stun Bloons for 1 second (except the Cold Sentry).


=== Crushing Sentry ===
=== Crushing Sentry ===
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==In other languages==
==In other languages==
{{BTD6 langs
{{BTD6 last updated|55.2|section=y}}
|ar name          =خبير الحراسة
{{langlist
|ar description   =انتشار الحراس بأنواع مختلفة من الضرر بناءً على حاجتك.
|key=Sentry Expert
|da name          =Sensorekspert
|label=Name
|da description   =Sensormaskingeværer indsættes med forskellige skadetyper baseret på dine behov.
|collapsed=
|de name          =Wachenexperte
|ar   =خبير الحراسة
|de description   =Wachtürme werden mit verschiedenen Schadensarten eingesetzt – basierend auf deinen Bedürfnissen.
|da  =Sensorekspert
|es name          =Centinela experto
|de  =Wachenexperte
|es description   =Los centinelas se despliegan con diferentes tipos de daño según tu necesidad.
|es  =Centinela experto
|es-la name      =Centinela experto
|es-la=Centinela experto
|es-la description=Los centinelas se despliegan con diferentes tipos de daño según tu necesidad.
|fi  =Vartioinnin asiantuntija
|fi name          =Vartioinnin asiantuntija
|fr  =Sentinelle experte
|fi description   =Vartiotykit käyttävät erilaisia vahinkotyyppejä tarpeidesi mukaan.
|it  =Sentinella esperta
|fr name          =Sentinelle experte
|ja  =見張りエキスパート
|fr description   =Les sentinelles sont déployées avec différents types de dégâts selon tes besoins.
|ko  =경비 전문가
|it name          =Sentinella esperta
|nl  =Geschutsexpert
|it description   =Le sentinelle vengono schierate con diversi tipi di danno in base alle tue esigenze.
|no  =Vaktekspert
|ja name          =見張りエキスパート
|pl  =Strażnik ekspert
|ja description   =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。
|pt-br=Especialista em Torres
|ko name          =경비 전문가
|ru  =Эксперт по турелям
|ko description   =필요에 따라 다른 공격 유형의 경비 탑을 배치할 수 있습니다.
|sv  =Vakttornsexpert
|nl name          =Geschutsexpert
|th  =ผู้ชำนาญด้านป้อมปืน
|nl description   =Geschutskoepels doen verschillende soorten schade, afhankelijk van je behoeften.
|tr  =Gözcü Uzmanı
|no name          =Vaktekspert
|zh-cn=哨兵专家
|no description   =Vakter utplasseres med forskjellige skadetyper etter dine behov.
|zh-tw=岗哨專家
|pl name          =Strażnik ekspert
}}
|pl description   =Strażnicy rozlokowują się z różnymi typami zadawanych obrażeń w zależności od twoich potrzeb.
{{langlist
|pt-br name      =Especialista em Torres
|key=Sentry Expert Description
|pt-br description=Sentinelas são montadas com diferentes tipos de dano de acordo com sua necessidade.
|label=Description
|ru name          =Эксперт по турелям
|collapsed=
|ru description   =Выставляются турели с различными видами урона, в зависимости от ваших потребностей.
|ar  =انتشار الحراس بأنواع مختلفة من الضرر بناءً على حاجتك.
|sv name          =Vakttornsexpert
|da  =Sensormaskingeværer indsættes med forskellige skadetyper baseret på dine behov.
|sv description   =Vaktkulsprutorna placeras ut med olika skadetyper, beroende på dina behov.
|de  =Wachtürme werden mit verschiedenen Schadensarten eingesetzt – basierend auf deinen Bedürfnissen.
|th name          =ผู้ชำนาญด้านป้อมปืน
|es  =Los centinelas se despliegan con diferentes tipos de daño según tu necesidad.
|th description   =ป้อมปืนระวังภัยมีประเภทดาเมจหลายแบบตามความต้องการ
|es-la=Los centinelas se despliegan con diferentes tipos de daño según tu necesidad.
|tr name          =Gözcü Uzmanı
|fi  =Vartiotykit käyttävät erilaisia vahinkotyyppejä tarpeidesi mukaan.
|tr description   =Gözcüler ihtiyacına göre farklı hasar türleriyle görevlidir.
|fr  =Les sentinelles sont déployées avec différents types de dégâts selon tes besoins.
|zh-cn name      =哨兵专家
|it  =Le sentinelle vengono schierate con diversi tipi di danno in base alle tue esigenze.
|zh-cn description=根据你的需要，为哨兵部署不同类型的伤害。
|ja  =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。
|zh-tw name      =岗哨專家
|ko  =필요에 따라 다른 공격 유형의 경비 탑을 배치할 수 있습니다.
|zh-tw description=根據你的需要，哨兵部署不同的傷害類型。
|nl  =Geschutskoepels doen verschillende soorten schade, afhankelijk van je behoeften.
 
|no  =Vakter utplasseres med forskjellige skadetyper etter dine behov.
|last updated=43.1
|pl  =Strażnicy rozlokowują się z różnymi typami zadawanych obrażeń w zależności od twoich potrzeb.
|pt-br=Sentinelas são montadas com diferentes tipos de dano de acordo com sua necessidade.
|ru  =Выставляются турели с различными видами урона, в зависимости от ваших потребностей.
|sv  =Vaktkulsprutorna placeras ut med olika skadetyper, beroende på dina behov.
|th  =ป้อมปืนระวังภัยมีประเภทดาเมจหลายแบบตามความต้องการ
|tr  =Gözcüler ihtiyacına göre farklı hasar türleriyle görevlidir.
|zh-cn=根据你的需要，为哨兵部署不同类型的伤害。
|zh-tw=根據你的需要，哨兵部署不同的傷害類型。
}}
}}


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