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BTD6 Pedia

Monkey Knowledge

Door Gunner

Door Gunner in BTD6: Special Poperations can carry a tier 4 or lower tower that keeps attacking in flight, then drop it anywhere. How it works.

Special Poperations Heli allows tier 4 and below Monkey Towers to attack Bloons while in transit.

In-game description

Guide

Door Gunner is a sixth-row Military knowledge that gives the Heli Pilot's Special Poperations a new ability: it can pick up one of your towers, carry it around while it keeps attacking, and drop it somewhere else whenever you choose. You need 14 Knowledge Points in the Military tree, Charged Chinooks and a one-time 1,000 Monkey Money. Together with Aeronautic Subsidy, it unlocks Advanced Logistics. It was added in version 17.

How it changes the game

Special Poperations (x-5-x Heli Pilot) already has a Redeploy ability that moves a tower instantly. Door Gunner turns that into a flying gun platform:

  • Pick up a tower: the Heli flies to the chosen tower and lifts it. Any tower of tier 4 or lower can be carried. Heroes cannot.
  • It keeps attacking: the carried tower fires from inside the Heli and ignores line-of-sight blockers. You cannot select it, change its targeting or use its abilities while it is carried, and its ability cooldowns are paused.
  • Drop it anywhere valid: use the ability again to place the tower, similar to Redeploy.
  • Shared cooldown: Door Gunner and Redeploy share their cooldown, so using one puts the other on cooldown, and you cannot Redeploy while carrying a tower.

Watch out for one detail: selling the Heli Pilot while it carries a tower also sells the carried tower. Version 56.2 fixed a display issue with redeployed towers.

Practical uses include moving a strong tier 4 tower to wherever a leak is happening, or letting a tower with limited range follow the Heli around the map.

Is it worth it?

Priority: situational, but a required route node. The ability is fun and occasionally clever, yet few standard strategies depend on it. Most players buy it because Advanced Logistics, which makes every Military tower 5% cheaper, requires Door Gunner. Since version 17, Advanced Logistics sits below Door Gunner instead of Charged Chinooks.

Where it works

Door Gunner works wherever Monkey Knowledge is enabled, including Military Only, Impoppable and freeplay. It is disabled in CHIMPS and in challenges that switch knowledge off. Rogue Legends has its own progression, where Door Gunner is a separate Rogue XP Shop unlock for 1,500 Rogue XP.

Frequently asked questions

What does Door Gunner do?

It lets Special Poperations carry one tier 4 or lower tower, which keeps attacking while carried, and drop it anywhere.

Can Door Gunner carry heroes or tier 5 towers?

No. Only towers of tier 4 or lower, and not heroes.

Can the carried tower use its ability?

No. Its abilities cannot be activated while carried, and their cooldowns pause.

What happens if I sell the Heli while it carries a tower?

The carried tower is sold too.

Is Door Gunner required for Advanced Logistics?

Yes, together with Aeronautic Subsidy.