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Sentries deploy with different damage types based on your need.
~ BTD6 description


Sentry Expert is the 4th upgrade of Path 1 for the Engineer Monkey. It allows the Engineer to create specific sentries that specialize in popping specific bloon types. The Engineer may produce specific types depending on what bloons spawn within or near his radius.

When no special Bloon types are present, the Sentry Expert cycles between Crushing, Boom, Cold and Energy Sentries in that order.

Types of SentriesEdit

There are four types of sentry that the Engineer may produce. All sentry types despawn after 25 seconds. (30 with MK)

Crushing SentryEdit

Crushing sentry

Crushing Sentry

The crushing sentry appears red and shoots spiked balls reminiscent of the Dart Monkey's Juggernaut upgrade. It has the highest popping power of any sentry. These balls deal 2 damage to Ceramic Bloons and bounce off of obstacles.

Pierce: 22
Attack Speed: 0.75/s

Does not spawn if Lead Bloons are within range of the Engineer, but it will spawn if there are Ceramic Bloons nearby.

Energy SentryEdit

Energy sentry

Energy Sentry

The energy sentry appears yellow and shoots laser blasts reminiscent of the Super Monkey's Laser Vision upgrade. It has the highest attack speed, however the lowest pierce of any sentry. Laser blasts can pop frozen bloons.

Pierce: 4
Attack Speed: 1.75/s

Does not spawn if Lead Bloons, Ceramic Bloons or Purple Bloons are within range of the Engineer.

Cold SentryEdit

Cold sentry

Cold Sentry

The cold sentry appears blue and shoots snowballs reminiscent of the Ice Monkey's Cryo Cannon upgrade. Affected bloons also gain the Permafrost effect. Snowballs pop and freeze bloons in a small radius. Cannot affect Whites, Zebras, or Leads.

Popping Power: 15
Attack Speed: 0.75/s

Does not spawn if Ceramic Bloons, White Bloons or Zebra Bloons are within range of the Engineer.

Boom SentryEdit

Boom sentry

Boom Sentry

The boom sentry appears black and is slightly larger than other sentries and shoots bombs reminiscent of the Bomb Shooter. Bombs pop bloons in a small radius and can pop frozen Bloons and Lead Bloons.

Popping Power: 15
Attack Speed: 0.75/s

Does not spawn if Ceramic Bloons, Black Bloons or Zebra Bloons are within range of the Engineer, but will spawn if there are Lead Bloons nearby.

TipsEdit

  • Just like Laser Blasts, the Energy Sentry can't pop Lead or Purple Bloons.
  • Similar to totems, sentries cannot be buffed by Alchemists. Buffing the Engineer will not buff the Sentries.
  • The Crushing Sentry deals double damage to Ceramic Bloons but can't pop Lead Bloons.
  • Even though it cannot affect them, cold sentries will still spawn if there are Lead Bloons.
    • There is a bug/special case where only cold sentries will spawn when there are DDTs present.

GalleryEdit

TriviaEdit

  • Sentry Expert's upgrade icon features all four types of Sentries that the Sentry Expert can create.
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