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Inter-Tower Interactions, Tower-Tower Interactions, or simply Tower Interactions are instances of two or more towers or powers interacting with each other. As opposed to Player-Initiated interactions such as purchasing an upgrade, or activating an ability, Inter-Tower interactions are usually a secondary outcome of a player action and require at least two towers to be present. One of these towers acts as the source, and the other is the target.

An example would be selling a Portable Lake with a Monkey Sub inside. The removal of the Lake will also destroy the Monkey-Sub, despite the player not selling the Monkey-Sub first. A non-example would be Transforming Tonic. Even though the ability activation causes the Alchemist to turn into a Vicious Monster, these are both the same tower, and thus fail to satisfy the population requirements of a tower interaction (though this would be an example of intra-tower interactions).

In Bloons TD 6, there are several main instances of tower interactions: Standard Buffs, Transformation Buffs, Bloon Debuffs/Indirect Buffs, Sacrifice, Redeployment, Carrying, Deploy, Platforms and more. These categories may have some overlap. This page list all Tower Interactions in BTD6 organized by the aforementioned categories, with a short description and any unusual behavior "quirks".

List of All Standard Tower Interactions[]

Standard Buffs[]

See also: Tower Buffs

These interactions occur when one tower, the source, enhances the Attack Speed, Damage, Camo Detection, Income, or other statistical aspects of a target tower. This is the largest category of interactions.

Source Eligible Targets Behavior Quirks
All towers that can source interaction. As well as any MK necessary. Use Icons. Description of all eligible towers. Use Icons if possible. Brief description of interaction and name.

Brief description of interaction effects.

Description of what happens when one tower is sold.

How does Co-Op affect this interaction?

Any other sort of quirky behavior

Does the upgrade stack w/ itself?

Interactions with rare towers, like sentry guns or powers.

050-IceMonkey

Absolute Zero

000-IceMonkey

Ice Monkey
(All crosspaths)

When the absolute zero ability activates, all ice monkeys on screen will get double attack speed for 10 seconds. Will it affect Co-Op ice towers? Will it affect itself?

Stacks with itself. Does not affect Cold Sentries.

400-MonkeySub

Bloontonium Reactor

FirstStrikeCapabilityUpgradeIcon

Water-Based Ability Towers and Heroes

(Within Range)

If there's a water tower with an ability in range of a bloontonium reactor, it will get it's cooldown reduced by 15%. Co-op included?


500-MonkeySub

Energizer

ActivatedAbilityIcon

Towers/Heroes with Activated Abilities.

Every tower on screen with an ability, will get their ability up 20% faster if there's an energizer on screen.

This changes to 50% with an Energizer.

Does not stack in Co-Op?

Will affect Co-Op towers.

005-MonkeySub

Sub Commander

000-MonkeySub

Monkey Sub

(All Crosspaths)

Within Sub Commander range Monkey Sub can be doubled all attack damage and +4 attack pierce (except First strike First Strike Capability First strike missile).
050-SniperMonkey

Elite Sniper

000-SniperMonkey

Sniper Monkey

(Any tier)

Elite sniper gives every other sniper 33% attack speed and a new elite targeting. Co-Op affected?
500-MonkeyBuccaneer

Carrier Flagship

PortableLakeIcon

All Water Towers

(Itself Included?)

BTD6 Monkey Ace

Monkey Ace

400-SuperMonkey

Sun Temple

(On water only)

500-SuperMonkey

True Sun God

(On water only)

555-SuperMonkey

Vengeful True Sun God

(On water only)

Increases Attack speed of towers by ~20%. See Platform for more info on which towers can be held.
005-MonkeyBuccaneer

Trade Empire

003-MonkeyBuccaneer

Merchantmen

or

004-MonkeyBuccaneer

Favored Trades

Increase $20 up to 20
005-WizardMonkey

Prince of Darkness

004-WizardMonkey

Necromancer: Unpopped Army

(Including Prince of Darkness Bloons)

Does it stack with itself in co-op?

No.

400-SuperMonkey

Sun Temple

NoParagons2

All Towers and Heroes except Paragons

(Does not affect itself, but it will affect other Sun Temples.)

500-SuperMonkey

True Sun God

or

555-SuperMonkey

Vengeful True Sun God

NoParagons2

All Towers and Heroes except Paragons and itself.

Does not affect itself, but will affect other TSG in Co-Op?
030-NinjaMonkey

Shinobi Tactics

000-NinjaMonkey

Ninja Monkey

(All Crosspaths)

+8% attack speed and pierce, affects nearby Ninjas Stackable with itself 20x
200-Alchemist

Acidic Mixture Dip

NoParagons2

All Towers and Heroes

(Except Paragons, Psi, Etienne, Farm, Glue, non-Expertise Villages (?), other Alchs, and Sub Towers)

Gives Lead-Popping and +1 damage to Ceramics and MOAB-class Not Etienne, Carrier Planes
300-Alchemist

Beserker Brew

NoParagons2

All Towers and Heroes

(Except Paragons, Etienne, Farm, Glue, non-Expertise Villages (?), other Alchs, and Sub Towers)

+10% range, +2 pierce, +1 damage, +11.11% attack speed (brew, targets the closest non-brewed tower per shot, lasts 5.0 seconds or 25 shots)
400-Alchemist

Stronger Stimulant

NoParagons2

All Towers and Heroes

(Except Paragons, Etienne, Farm, Glue, non-Expertise Villages (?), other Alchs, and Sub Towers)

+15% range, +3 pierce, +1 layers popped per hit, +17.6% attack speed (strong brew, targets the closest non-brewed tower per shot, lasts 12 seconds or 40 shots)
500-Alchemist

Permanent Brew

NoParagons2

All Towers and Heroes

(Except Paragons, Etienne, Farm, Glue, non-Expertise Villages (?), other Alchs, and Sub Towers)

+15% range, +2 pierce, +17.6% attack speed (strong brew, targets the closest non-brewed tower per shot, lasts infinitely)
000-BananaFarm

Banana Farm

(All crosspaths)

040-Druid

Jungle's Bounty

Each Banana Farms within Junge's Bounty range can increase $240 by ability each used.
004-Druid

Poplust

000-Druid

Druid

(All crosspaths)

Stackable 5x within range, each incrase 15% attack speed and pierce
500-BananaFarm

Banana Central

400-BananaFarm

Banana Research Facility

All Banana Research Facility crates to become worth 25% more ($300->$375)
004-BananaFarm

Central Market

or

005-BananaFarm

Monkey Wall Street

003-MonkeyBuccaneer

Merchantman

or

004-MonkeyBuccaneer

Favored Trades

or

005-MonkeyBuccaneer

Trade Empire

000-MonkeyVillage

Monkey Village

NoParagons2

All Towers and Heroes

(Except Paragons)

Increases range of towers by 10% Does not expand range of Arctic Wind Platform
200-MonkeyVillage

Jungle Drums

NoParagons2

All Towers and Heroes

(Except Paragons)

Increases attack speed of towers by 18%
300-MonkeyVillage

Primary Training

PrimaryBtn

Primary Monkeys

Increases +10% range, +1 pierce, and +25% projectile speed
400-MonkeyVillage

Primary Mentoring

PrimaryBtn

Primary Monkeys

500-MonkeyVillage

Primary Expertise

PrimaryBtn

Primary Monkeys

020-MonkeyVillage

Radar Scanner

NoParagons2

All Towers and Heroes

(Except Paragons)

Gives camo detection to towers. Does not work with
EtiennePortraitLvl10

Etienne Level 8

NoParagons2

Not Paragons

(Heroes in Co-op?)

Gives camo detection to towers.
030-MonkeyVillage

Monkey Intelligence Bureau

NoParagons2

All Towers and Heroes

(Except Paragons)

Farms?
040-MonkeyVillage

Call To Arms

NoParagons2

All Towers and Heroes

(Except Paragons)

050-MonkeyVillage

Homeland Defense

NoParagons2

All Towers and Heroes

(Except Paragons)

001-MonkeyVillage

Monkey Business

PontoonPortrait

up to tier 3

10% discount
002-MonkeyVillage

Monkey Commerce

PontoonPortrait

up to tier 3

Stackable 3x (right column?) 5% discount
003-MonkeyVillage

Monkey Town

PontoonPortrait

Cash gained

50% more cash from pops
004-MonkeyVillage

Monkey City

PontoonPortrait

all money generating towers, excluding paragons

Free dart monkey each round 15% income buff
005-MonkeyVillage

Monkeyopolis

PontoonPortrait

Same as Monkey City

040-EngineerMonkey

Overclock

PontoonPortrait

All Towers But Paragons

050-EngineerMonkey

Ultraboost

PontoonPortrait

All Towers But Paragons

GwendolinPortrait

Gwendolin

InstaMonkeyCollectionBtn

But not itself, (Unless in co-op?)

StrikerJonesPortraitLvl10

Striker Jones

PontoonPortrait

All Explosive Sources

ObynGreenfootLv3

Obyn Greenfoot

000-Druid

Druids

ObynGreenfootLv10

Obyn Greenfoot

MagicBtn

Magic Monkeys

BenjaminPortraitLvl3

Benjamin

PontoonPortrait

Pontoon

BenjaminPortraitLvl7

Benjamin Level 6

030-BananaFarm

Monkey Bank

EziliTotem

Ezili Totem

InstaMonkeyCollectionBtn

But not itself, (Unless in co-op?)

EziliPortraitLvl7

Ezili Level 11

004-WizardMonkey

Necromancer: Unpopped Army

and maybe POD?
PatFustyPortraitLvl3

Pat Fusty Level 3

PontoonPortrait

All Towers & Heroes

AdoraPortraitLvl7

Adora Level 7

PontoonPortrait

Sun Avatar

AdmiralBrickellPortraitLvl3

Admiral Brickell Level 3

PortableLakeIcon

All Water Based Towers

Temple on ice?

Water Paragons?

MonkeyBoostIcon

Monkey Boost

NoParagons2

Not Paragons

ThriveIcon

Thrive

PontoonPortrait

All Income

EnergisingTotemIcon

Energizing Totem

PontoonPortrait

All Towers & Heroes


Transformation Buffs[]

These interactions occur when a tower(s) transforms another tower into a visually and/or tactically distinct tower. There are 5 main instances of Transformation Interactions. Some may include these interactions under standard buffs.

Source Eligible Targets Behavior Quirks
Supermonkeyfanclubphotoshop

Super Monkey Fan Club

Dart Monkey-0

Dart Monkey

Hi
050-DartMonkey

Plasma Monkey Fan Club

Dart Monkey-0

Dart Monkey

Total Transformation

Total Transformation

InstaRandomTier3

Any Monkey Tier 3 or less

Only monkeys affected are: Dart, Boomer, Ice, Glue, Sniper, Wizard, Super, Ninja, Alch, Druid, & Engi.
The Anti-Bloon

+

005-SuperMonkey

+

ThereCanBeOnlyOneIcon

There Can Be Only One

True Sun God

True Sun God

True Sun God

True Sun God

AdoraPortraitLvl20

Adora Level 20

555-SuperMonkey

Vengeful True Sun God

AdoraPortraitLvl20

Adora Level 20

Difference is only visual.

Also changes the look of Adora's Temple.


Sacrifice[]

These interactions occur when a tower, called the absorbent, absorbs other towers, called sacrifices. There are 4 main instances of Sacrifice Interactions.

Absorbent Eligible Sacrifices Behavior Quirks
400-SuperMonkey

Sun Temple
or
500-SuperMonkey
True Sun God

OdysseyNoHeroIcon

or
NoParagons2
All Towers within range except Paragons, Monkeys, Powers, and the Cave Monkey

Purchasing the Sun Temple will absorb the three most expensive set of towers out of the 4 categories: Primary, Military, Magic, and Support.

The same applies to the True Sun God except that it is able to absorb all 4 categories.

Co-Op towers can be absorbed.
Selling these upgrades will not restore the sacrifices.

555-SuperMonkey

Vengeful True Sun God

The Anti-Bloon

+

005-SuperMonkey

Legend of the Night

AdoraPortraitLvl7

Adora Level 7

InstaMonkeyCollectionBtn

Any Monkey??

ParagonIcon

Paragons

Any Monkey of the Same Tower type.
Monkeyopolis Banana Farm

Need to add soulbind as well. Though it is deleted, it is still worth mentioning

Redeployment[]

Main article: Redeployment

These interactions occur when a tower, the vehicle, picks up another tower, the passenger, and places it in another spot. There is only one tower that can perform the redeployment interaction. (Though Darkshift allows the Super Monkey to redeploy itself).

Carrying[]

This interaction occurs when a source tower, the vehicle, carries another tower, the gunner, and allows it to attack in flight. It is similar to Redeploy, but the gunner is able to attack while being carried. There is only one instance of the Carrying Interaction.

Vehicle Eligible Gunners Behavior Quirks
Special Poperations
+

DoorGunnerIcon

Special Poperations with Door Gunner MK.

Non-hero towers below Tier 5
  • Door Gunner Monkey knowledge allows Special Poperations Heli Pilot to pick up eligible towers and allow them to fly in attacks.
  • Tower under influence of Door Gunner is placed on high ground and cannot be tapped onto to view its menu.
  • More WIP go here...
  • ...
  • ...

Platforms[]

This interaction occurs when the source tower, called the platform, generates land or water that another tower, the occupant, can be placed upon. There are four main instances of Platform Interactions.

Platform Eligible Occupants Behavior Quirks
Carrier Flagship

Carrier Flagship

Small Towers: Dart monkey, Boomerang, Tack, Ice, Glue, Bomb, Sniper, Dartling, Wizard, Ninja, Alchemist, Druid, Engineer. All Heroes except Captain Churchill and Admiral Brickell
  • Grants slightly higher height to towers placed on platform, allowing them to partially ignore line of sight.
  • When Flagship is sold, all towers on platform disappear.
  • Total Tranformation does not allow large towers to be moved onto the platform via Redeploy.
  • No Exceptions to selling rule.
  • Paragons can sit on top of the flagship via purchasing the upgrade on one of the consituent tier-5 towers that is already sitting on the flagship. However, they cannot be deployed onto the platform afterwards.
PontoonPortrait

Pontoon

Any land tower except Portable lake?
PortableLakePortrait

Portable Lake

Any tower except other lakes? But maybe with artic wind??
Ice Platform Any tower.

Deploy[]

See also: Sub-Towers

These interactions occur when a tower, called the source, creates another tower, called the sub-tower, and deploys it on the map. There are several examples of the Deploy interaction. Only the instances of interactable sub-towers are listed. For a full list, click here.

Source Sub-Towers Behavior Quirks
050-HeliPilot

Special Poperations

MarinePortrait

Marine

400-SuperMonkey

or

500-SuperMonkey

True Sun God

300-SuperMonkey

Mini Sun Avatar

555-SuperMonkey

Vengeful True Sun God

555-SunAvatarTurret

Mini Vengeful Sun Avatar

EngineerMonkey

Engineer Monkey

SentryPortrait

Sentry

Will it still deploy in support Chinook?

Will it deploy in Co-Op player zone?

Will it deploy on Ice Platform

It will deploy onto carrier Flagship

400-EngineerMonkey

Sentry Expert

SentryExpertUpgradeIcon

Sentry Expert Sentry

500-EngineerMonkey

Sentry Champion

SentryParagonPortrait

Champion Sentry

ObynGreenFootPortrait

Obyn Greenfoot Level 4

NatureTotem

Nature's Ward Totem

t t
EziliPortraitLvl7

Ezili Level 7

EziliTotem

Sacrificial Totem

t t

Activate Ability[]

This interaction occurs when a tower or power activates the ability of another tower. This instance is unique to the tech bot.

Source Target Behavior Quirks
TechbotPortrait

Tech Bot

Dart Monkey-0

all Towers with abilities

d (Special cases about tech bot interaction.)
030-BananaFarm

Monkey Bank

030-BananaFarm

Monkey Bank

Collect All feature technically is an ability by some stretch.

Target Priority[]

This interaction occurs when a tower or ability changes the target priority or target options of another tower. There are only two instances of the target priority interaction occurring.

Source Target Behavior Quirks
050-SniperMonkey

Elite Sniper

000-SniperMonkey

Sniper Monkey (Any tier)

  • Brief description of interaction
  • Brief description of interaction effects
  • Description of what happens when one tower is sold.
  • How does Co-Op affect this interaction?
  • Any other sort of quirky behavior
  • Interactions with rare towers, like sentry guns or powers.
000-DartlingGunner

Dartling Gunner
+
EmergencyUnlockIcon
Emergency Unlock MK

000-DartlingGunner

Dartling Gunner

Technically an activated ability that activates all Dartlings at once no matter what target priority (?).
InstaMonkeyCollectionBtn

All Towers and Heroes

200-MonkeySub

Advanced Intel
(And its crosspaths)

All towers give Advanced Intel increased effective range (mention camo caveat)

List of Indirect Tower Interactions[]

These categories do not perfectly fit the definition of direct tower interactions, usually due to requiring a third medium, such as a player, the map, or Bloons. However, it is still useful to mention them here.

Indirect Buffs (Bloon Debuffing)[]

This interaction occurs when a tower makes a Bloon slower or more vulnerable to attack, thus indirectly buffing another tower's attack. Several examples exist. Some may include these under Standard Buffs.

Source Eligible Targets Behavior Quirks
040-GlueGunner

Glue Strike

Any damaging tower
050-GlueGunner

Glue Storm

Any damaging tower
400-IceMonkey

Embrittlement

or

Super Brittle

Super Brittle

Any damaging tower
500-SniperMonkey

Cripple MOAB

BloonImpactUpgradeIcon

Stunning Towers

SaudaPortraitLvl10

Sauda level 7

More damage versus stunned Hi
SuperGlueUpgradeIcon

DoT/Slowdown/Immobility Towers

SaudaPortraitLvl10

Sauda level 11

More damage versus harmed Hi
Time Stop

All Towers and Heroes

All towers but Paragons? Hi

Gathering[]

These interactions occur when a tower, the Gatherer, collects traps, crates, and bananas generated by another tower. In BTD6 there is only one tower able to perform the Gather Interaction.

Source Eligible Targets Behavior Quirks
BTD6 Monkey Farmer

Monkey Farmer

004-EngineerMonkey

Bloon Trap

or

005-EngineerMonkey

XXXL Trap

BTD6 Monkey Farmer

Monkey Farmer

000-BananaFarm

Banana Farm
(All crosspaths)

BTD6 Monkey Farmer

Monkey Farmer

040-SniperMonkey
Supply Drop

or

050-SniperMonkey
Elite Sniper

Collects crates
BTD6 Monkey Farmer

Monkey Farmer

040-HeliPilot
Support Chinook

or

050-HeliPilot
Special Poperations

Collects crates

Projectile[]

This interaction occurs when a tower or tower's projectile interacts with another tower's projectile. There is only one instance of Projectile Interactions,

Source Target Behavior Quirks
400-DartlingGunner

Plasma Accelerator
or
500-DartlingGunner

Ray of Doom
+
CrossTheStreamsIcon
Cross the Streams MK

400-DartlingGunner
Plasma Accelerator
or
500-DartlingGunner
Ray of Doom
Brief description of interaction

Brief description of interaction effects

Description of what happens when one tower is sold.

How does Co-Op affect this interaction?

Any other sort of quirky behavior

Interactions with rare towers, like sentry guns or powers.

Liberate[]

This interaction occurs when a tower, called the liberator, performs an action that activates a pre-existing tower on the map. There is only one instance of the Liberate Interaction occurring in BTD6. Some may include this under the Deploy Interaction.

Liberator Prisoner Behavior Quirks
Mortar Monkey BTD6

Mortar Monkey
(Any Crosspath)

Cave Monkey

Cave Monkey

Aim the Mortar Monkey at the Frozen Cave Monkey on the Map Frozen Over, and let it fire 30 shots to break the Cave Monkey free.


Cave Monkey will then randomly spawn close to the entrance.

  • TBA (Research on Cave Monkey footprint and what happens if no space left.

Free Cost[]

This interaction occurs when a tower, called the source, generates a cost-free tower which the player must place. As such, it does not fall under Deploy Interactions. There is only one tower that performs the Free Interaction.

Source Free Tower Behavior Quirks
004-MonkeyVillage
or
005-MonkeyVillage

000-DartMonkey
Dart Monkey
  • Brief description of interaction
  • Brief description of interaction effects
  • Description of what happens when one tower is sold.
  • How does Co-Op affect this interaction?
  • Any other sort of quirky behavior
  • Interactions with rare towers, like sentry guns or powers.
Primary Mentoring Tier 1 Upgrades For Primary Towers
Primary Expertise Tier 2 Upgrades For Primary Towers

Monkey City/Monkeyopolis.

Range[]

Range-based interactions.

Target Range Source Behavior Quirks
030-EngineerMonkey Range buffs (e.g. BBrew, Village)
  • Increasing range allows for foam to be dispensed further from the Engineer at will.
  • If the range buff expires or is removed otherwise, and the foam target is placed off-range before this occurs, the foam attack defaults back to Close.
004-EngineerMonkey Range buffs (e.g. BBrew, Village)
  • Increasing range allows for 0-1-4 (and 0-2-4) Bloon Traps to be dispensed further from the Engineer at will.
  • The same applies to XXXL Traps with the 0-1-5 (and 0-2-5) crosspath.
  • If the range buff expires or is removed otherwise, and the trap target is placed off-range before this occurs, the trap attack defaults back to Close.
ObynGreenFootPortraitLvl10 Range buffs (e.g. BBrew, Village)
  • Increasing range allows for Obyn's Wall of Trees to be placed further from him at will.
  • If the range buff expires or is removed otherwise, and the trap target is placed off-range before this occurs, the trap attack defaults back to Close.
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