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Synergies or Tower Combos are combinations of two or more towers that are extremely effective at damaging bloons, acquiring income, or some other specific task. As opposed to amassing a large number of towers, or giving a single tower a ton of buffs, synergies are usually characterized by high cost efficiency, good coverage of certain damage needs (such as single target damage and grouped popping power), and the ability to pop most Bloon types. This is due to the individual towers excelling in different use cases, thus being able to cover each other's weakness while excelling in their own strengths.

In terms of Bloon TD 6, synergies are most relevant in gamemodes like C.H.I.M.P.S. and half-cash where effective tower combinations can survive long stretches of rounds, allowing the player to amass money for an expensive late game upgrade (which may belong to the synergy itself). In fact, some synergies are so effective that they can remain relevant, or even manage to survive, during late game/freeplay rounds, as is evident in 2-Tower C.H.I.M.P.S (2TC).

An example of an effective synergy is the Prince of Darkness and M.A.D. as the latter has strong M.O.A.B popping power but struggles against spaced Bloons like Super Ceramics due to its low rate of fire. The Prince of Darkness covers this weakness by casting a powerful graveyard that suppresses even the densest Bloon rushes. This powerful combo has been used for 2TC.

This page lists some towers that synergize with nearly every other tower in the game, as well as some more specific combos. It is by no means a comprehensive list.

When it comes to cross-pathing, assume that all towers stated have no cross-paths other than the upgrade that is being stated. (X-0-0, 0-X-0, and 0-0-X)

What is a "Synergy"?[]

What makes a tower combo a "synergy" rather than a simple benefit is by obtaining unique advantages from working well together that the two (or more) cannot simply achieve alone. Sometimes, there are secondary benefits for Tower A that are special to that tower and its interaction with Tower B (e.g. Spiked Balls attacking slow enough to sustain both Bbrew's buffs, the brew and its AMD).

Tower synergies are categorized into distinct types:

  • Mutual - Tower A is directly benefited by the actions of Tower B, and Tower B is directly benefited by actions of Tower A. Mutual synergies help each other's weaknesses while fulfilling their strengths together. An example of this is M.A.D. + Prince of Darkness.
  • One For The Other - Tower A is directly benefited by actions of Tower B, which makes Tower A become much stronger, but Tower A's assistance for Tower B is minor or absent. Most purely buff-oriented towers in combination with an offensive tower (such as the Alch buff in combination with Bloonjitsu) are classified under this category.
  • Indirect - Tower A indirectly helps compensate for the perceived weaknesses of Tower B. Together, this results in them helping each other but not directly together. For example, Crossbow + Churchill is considered indirect, as Crossbow helps save up for Churchill, but Crossbow doesn't necessarily help Churchill while in battle.

This article mostly covers synergies classified as "Mutual" or "One For The Other".


Universal Synergies[]

See also: Buffs

The following are some towers that synergize well with most towers. In most cases, these towers are simply able to provide buffs with other towers. Consider adding them to any of the specific combos in the following sections.

First Second Synergy
400-Alchemist
Stronger Stimulant
Moderately fast-attacking and/or multi-projectile towers
  • Stronger Stimulant further improves the Berserker Brew's duration and effectiveness of most bonus stats (with exception of damage, kept as +1). Its brew buffs last long enough to sustain up to 2 nearby towers at a time and also sustain virtually 100% uptime to a tower that attacks slow enough.
  • The ideal combo with Stronger Stimulant is when paired with a moderately fast-attacking tower with multiple projectiles. Best examples where this makes the biggest difference towards individual towers compared to regular Berserker Brew include Sky Shredder and The Tack Zone.
200-MonkeyVillage
Jungle Drums
All non-Paragon towers
  • Jungle Drums adds a universal bonus +17.8% attack speed for all towers within range. Increased attack speed allows for more overall damage at bloons.
  • Unlike Alchemists and Overclocks, Sub-Towers will always benefit off Jungle Drums as long as either themselves or their parents receive the buff.
300-MonkeyVillage
Primary Training
PrimaryBtn
All Primary Monkeys
  • For a low price of just $800 from an existing Jungle Drums, it gives an extra range buff to nearby Primary Monkeys, along with +1 pierce and extra projectile speed. In terms of synergy, most Primary Monkeys appreciate from these buffs, with the best synergy on Tack Shooters.
  • MOAB Glue also appreciates greatly from this, as giving an existing MOAB Glue with +1 pierce makes it better at slowing down denser groups of blimps.
400-MonkeyVillage
Primary Mentoring
PrimaryBtn
All Primary Monkeys
  • Alongside Primary Training buffs, Primary Mentoring also adds an additive +5 range, faster ability cooldowns, and free Tier 1 upgrades. In terms of synergy, this mainly assists strategies reliant on both tower spam and activated abilities, but it also makes for an appreciable bonus for Ice Monkeys and Tack Shooters.
  • Striker Jones strategies, which often bring in Bomb Shooters as part of his synergy, benefit hugely off Primary Mentoring, as Mauler spam becomes much cheaper to do by discounting the Bomb's expensive Tier 1 upgrades, in addition to other benefits that other Primary Monkeys can benefit from too.
  • The 10% reduced ability cooldowns might seem small, but it makes a big difference for expensive Tier 5 abilities in particular, and makes it easier to use abilities a bit more freely.
500-MonkeyVillage
Primary Expertise
PrimaryBtn
All Primary Monkeys
  • Alongside Primary Mentoring buffs, Primary Expertise also gives nearby Primary Monkeys +3 pierce instead of +1, even faster ability cooldowns, and free Tier 1 and 2 upgrades. In terms of synergy, this mainly assists strategies reliant on both tower spam and activated abilities. The higher base influence range also expands the coverage of spamming Primary Monkeys for greatly reduced cost.
  • Striker Jones strategies, which often bring in Bomb Shooters as part of his synergy, benefit hugely off Primary Mentoring, as Cluster spam becomes much cheaper to do by discounting the Bomb's expensive Tier 1 and 2 upgrades, in addition to other benefits that other Primary Monkeys can benefit from too.
  • The 20% reduced ability cooldowns makes a considerable difference for various ability-oriented towers, especially MOAB Eliminator.

Specific Combinations[]

The following are a list of synergies of two or three different towers. For the purposes of what defines a "synergy" in this article, the "first" tower type refers to the main tower type involved by being assisted from the "second" tower type, or also the "third" tower type if the third one is involved in a very specific synergy.

Dart Monkey[]

Top Path (Dart Monkey)[]

...

Middle Path (Dart Monkey)[]

First Second Third Synergy
050-DartMonkey
Plasma Monkey Fan Club
GwendolinPortrait
Gwendolin
N/A
  • Due to the relatively large amount of space required for PMFC to transform 20 dart monkeys, it pairs exceptionally well with Gwendolin, since her Firestorm ability allows all towers on the screen to gain additional pierce (starting at level 4+), damage (starting at level 17+) and giving all affected dart monkeys lead popping power, which really helps with the early and mid game.
500-MonkeySub
Energizer
500-MonkeyVillage
Primary Expertise
  • One of the biggest weaknesses of the PMFC is its relatively low uptime (50-second cooldown with a 15-second ability duration or 30% ability uptime) for an upgrade that is extremely weak without the ability. This makes the ability very punishing if it is accidentally pressed or its miss-timed. Energizer and Primary Expertise combined helps this by reducing the cooldown for its transformation. If the player has effective enough farms, and water to place, then the player should buy both for a 30% ability cooldown reduction or a 35-second cooldown (about 43% percent ability uptime) which is much more forgiving than before.
  • However, if the player is in an income-restrictive game mode like C.H.I.M.P.S., the player should opt for Primary Expertise, as it is cheaper, helps better with the defense, doesn't need water to place, also provides camo and useful buffs to primary monkeys.
002-IceMonkey
Ice Monkey
030-HeliPilot
Downdraft
  • One of the biggest weaknesses of the Plasma Monkey Fan Club is its relatively low uptime (50-second cooldown with a 15-second ability duration or 30% ability uptime) for an upgrade that is extremely weak without the ability. This makes the ability very punishing if it is off cooldown. The combination of a Downdraft to blow ceramics away, then an ice monkey, typically with Deep Freeze and Re-Freeze, or only Permafrost for very cheap stalling to lock it in place, can let a player have the ability up on all rounds.

Bottom Path (Dart Monkey)[]

...

Boomerang Monkey[]

Top Path (Boomerang Monkey)[]

Middle Path (Boomerang Monkey)[]

Bottom Path (Boomerang Monkey)[]

First Second Synergy
004-BoomerangMonkey
MOAB Press
003-GlueGunner
MOAB Glue
  • MOAB Press + MOAB Glue is an effective synergy for clumping up blimps, chaining them together for a more effective knockback. Together, they form a cheap but highly effective combo.
  • Note that the MOAB Press knockback is a fixed distance value, so adding any form of blimp slowdown will make the knockback appear more effective.

Bomb Shooter[]

Top Path (Bomb Shooter)[]

Middle Path (Bomb Shooter)[]

Bottom Path (Bomb Shooter)[]

Tack Shooter[]

Top Path (Tack Shooter)[]

First Second Synergy
500-TackShooter

Inferno Ring

005-IceMonkey

Icicle Impale

  • Since Inferno Ring can dish out a ton of DPS when bloons are in its range, Icicle Impale can keep MOAB-class bloons stuck in the range longer and does a better job at helping the Inferno RIng pop bloons than MOAB glue does.

Middle Path (Tack Shooter)[]

First Second Synergy
050-TackShooter
Super Maelstrom
PatFustyPortrait

Pat Fusty

  • Not unlike The Tack Zone, combining the Super Maelstrom ability with Rallying Roar allows every single one of the Super Maelstrom's blades to become affected by the roar's damage buff. As such, it can also deal a ridiculous amount of DPS for a very little cost compared to other Tier 5 towers, but requires more timing.
  • Compared to other options, Pat + Smael is superior against grouped bloons due to its enormous pierce.
040-EngineerMonkey
Overclock
  • Unlike Tack Zone, Super Maelstrom undeniably prefers Overclock due to allowing Smael to utilize its high pierce much more often and as the main buff on top of Pat Fusty. But like Tack Zone, Overclock can be chained on top of Pat Fusty to deal incredible damage.

Bottom Path (Tack Shooter)[]

First Second Synergy
005-TackShooter
The Tack Zone
PatFustyPortrait
Pat Fusty
  • Pat Fusty's Rallying Roar is applied to every single one of the Tack Zone's Tacks that it shoots out for the duration of the buff. Combined with's The Tack Zones's attack speed and dead zone, The Tack Zone can dish out a ridiculous amount of DPS for very little cost compared to other Tier 5 towers.
400-Alchemist
Stronger Stimulant
  • Stronger Stimulant is rather cheap overall but provides a very strong buff for The Tack Zone, buffing each individual shot of 32 tacks, amplifying its damage by a large margin, improving its measly pierce and range, all while still lasting respectably long.
040-EngineerMonkey
Overclock
  • Chaining it together with range-related buffs such as Pat Fusty's Rallying Roar makes the +66% attack speed buff much more effective than it appears.
  • This specific synergy doesn't pair as well for Alch buffs except Permanent Brew, as the buffs will wear out much faster and cause less uptime. Nevertheless, this does not invalidate the value of Alch buffs; it still works well together with Alch buffs.
500-IceMonkey
Super Brittle
  • Super Brittle's +4 damage debuff to bloons and blimps allows a Tack Zone to deal much better single-target damage, as the sheer numbers of projectiles per second from Tack Zone inflicts a massive amount of damage overall.
  • As Tack Zone tends to struggle against Super Ceramics and DDTs, Super Brittle's freeze and permafrosting effects help Tack Zone to catch these bloon types better.
  • In combination, they are a deadly combo within a short range, all while costing not too much overall.
400-MonkeyVillage
Primary Mentoring
  • Primary Mentoring's +5 range buff makes more difference for Tack Zone without Middle Path due to how much it improves the base Tack Zone's measly 30 range.

Ice Monkey[]

Top Path (Ice Monkey)[]

First Second Synergy
300-IceMonkey

Ice Shards

400-MonkeySub

Bloontonium Reactor

  • The continuous damage of the Bloontonium Reactor makes this a perfect combo for Ice Shards since it depends on having other towers pop bloons so that the Ice shards can easily be created. Also, the Bloontonium Reactor itself pops bloons fast enough to quickly activate the Ice Shards but slow enough to actually allow the Ice Shards to attack.

Middle Path (Ice Monkey)[]

First Second Synergy
040-IceMonkey

Snowstorm

040-MonkeyAce

Ground Zero

  • Snowstorm can temporarily slow Bloons advance, which in turn helps Ground Zero to affect more bloons.

Bottom Path (Ice Monkey)[]

Glue Gunner[]

Top Path (Glue Gunner)[]

First Second Synergy
500-GlueGunner
The Bloon Solver
050-DartlingGunner
M.A.D.
  • The Bloon Solver excels at cleaning up mass amounts of Super Ceramics, but struggles with dealing with MOABs. To compensate this weakness, the M.A.D. does exceptionally well against MOAB-class bloons, dealing 550 damage to MOABs per missile, but struggles to stop super ceramics, as missiles only deal 3 damage to non-MOABs on contact. Thus, by pairing the Bloon Solver with a tower that excels against MOABs, they both cover each other's weaknesses.
030-BombShooter
MOAB Mauler
  • The Bloon Solver excels at cleaning up mass amounts of Super Ceramics, but struggles with dealing with MOABs. Another tower that compensates for this weakness are MOAB Maulers, which deal 15 damage against MOAB Bloons per shot but struggles to normal bloons, and can be spammed across the map. Thus, by pairing the Bloon Solver with a tower that excels against MOABs, they both cover each other's weaknesses. This also applies to the MOAB Eliminator by extension.

Middle Path (Glue Gunner)[]

First Second Synergy
050-GlueGunner
Glue Storm
300-SuperMonkey
Sun Avatar
  • Glue Strike and Glue Storm add a flat damage increase to any projectile, synergizing best with low damage, high projectile towers. Sun Avatars are one of the best towers for outputting high quantities of projectiles while maintaining damage output from a distance. Glue Storm's ability also helps with slowing down ceramics.
005-TackShooter
The Tack Zone
  • Glue Strike and Glue Storm add a flat damage increase to any projectile, synergizing best with low damage, high projectile towers. The Tack Zone is the best tower for outputting high quantities of projectiles at a short distance, making it very effective. Similarly effective in Boss Events with Overdrive spam for single target damage. Glue Storm's ability also helps with slowing down ceramics.

Bottom Path (Glue Gunner)[]

First Second Synergy
Super Glue

Super Glue

005-EngineerMonkey

XXXL Trap

  • Super Glue can keep MOAB-class bloons stuck in place for so long that it gives enough time for XXXL to Instakill every single MOAB class bloons provided it has the support necessary glue can Insta kill D.D.T.s.
  • This combo allows for frontline XXXL Trap strategies to become far more effective.

Sniper Monkey[]

Top Path (Sniper Monkey)[]

Middle Path (Sniper Monkey)[]

Bottom Path (Sniper Monkey)[]

Monkey Sub[]

Top Path (Monkey Sub)[]

Middle Path (Monkey Sub)[]

Bottom Path (Monkey Sub)[]

Monkey Buccaneer[]

Top Path (Monkey Buccaneer)[]

Middle Path (Monkey Buccaneer)[]

First Second Synergy
050-MonkeyBuccaneer
Pirate Lord
004-Alchemist

Rubber to Gold

  • When a Blimp is affected with Rubber to Gold, the amount of cash that is received doubles, making this particularly effective on rounds that contain a lot of slow (or slowdown) blimps, like Round 94, 96, and 98.

Bottom Path (Monkey Buccaneer)[]

Monkey Ace[]

Top Path (Monkey Ace)[]

First Second Synergy
500-MonkeyAce

Sky Shredder

400-Alchemist

Stronger Stimulant

  • Sky Shredder attacks fast enough to utilize Stronger Stimulant's buffs effectively but also slow enough to sustain them for full uptime. This equates to a very significant damage buff, especially when also taking into account the extra attack speed and pierce.
  • Sky Shredder fires sprays of darts, each spray counting as one shot each, which means it can use as few buffs as possible to many more projectiles. In effect, this amplifies its overall dart damage by a lot.
  • The buffs from the Stronger Stimulant's +1 damage give roughly +50% damage overall to each individual dart.

Middle Path (Monkey Ace)[]

First Second Synergy
050-MonkeyAce

Tsar Bomba

PatFustyPortrait

Pat Fusty

  • It is not Fusty's Rallying Roar that makes Tsar + Pat a powerful synergy. Surprisingly, it's Pat's Big Squeeze. Pat's Big Squeeze ability can be used to "protect" a ZOMG while Tsar nukes the whole screen. The time delay from squeezing the ZOMG and additional stalling can be used to recharge Tsar's cooldown.

Bottom Path (Monkey Ace)[]

Heli Pilot[]

Top Path (Heli Pilot)[]

First Second Synergy
Apache Prime

Apache Prime

030-MonkeyVillage

Monkey Intelligence Bureau

  • Apache Prime's missiles and red lasers do not damage DDTs due to the fact that DDTs are immune to explosions and Energy Type (pops Black, White, Frozen) Energy-type lasers respectively, meaning that the only damage that the Apache Prime is doing to them via its machine gun with Plasma Plasma Type (pops Black, White, Lead, Frozen) damage and rotors with Normal Type (pops Black, White, Purple, Lead, Frozen) Normal-type damage. MIB solves this by making all attacks done by Apache Prime effectively Normal Normal Type (pops Black, White, Purple, Lead, Frozen), allowing all of them to brute force through all immunities of the DDTs. MIB even comes with camo detection inherited from Radar Scanner.
040-EngineerMonkey

Overclock

  • Apache Prime appreciates the constant +66% attack speed bonus given from Overclock's buff, albeit only 66% uptime due to being a Tier 5. In combination, Apache Prime does a noticeably better job at handling faster blimps, especially DDTs when also given MIB.
040-NinjaMonkey

Bloon Sabotage

  • While Sabo's 50% global slowdown benefits defenses by giving them more time to pop the bloons, Sabo benefits hugely with Apache Prime. Apache Prime's movement speed isn't the best at catching faster blimps (especially DDTs and weaker MOABs) without Bigger Jets, so an on-demand slowdown helps let it catch up to them better.

Middle Path (Heli Pilot)[]

Support Chinook can carry Permanent Brew around the map, allowing it to buff all towers.

Bottom Path (Heli Pilot)[]

First Second Synergy
Comanche Commander

Comanche Commander

Super Brittle

Super Brittle

  • Due to the mini Comanche's attack speed and for how many helicopters are attack bloons as 1 tower (including the parent), Super Brittle can dramatically increase the DPS of Commanche Commander with its +4 damage debuff applied onto bloons to every individual helicopter.

Mortar Monkey[]

Top Path (Mortar Monkey)[]

Middle Path (Mortar Monkey)[]

Bottom Path (Mortar Monkey)[]

Dartling Gunner[]

Top Path (Dartling Gunner)[]

First Second Synergy
300-DartlingGunner
Laser Cannon
002-IceMonkey
Re-Freeze
  • Re-Freeze is a very cost efficient Ice Monkey and when you combine it with the Laser Cannon, which can pop frozen bloons, the player has a deadly, but relatively cheap duo. One tower covers the weaknesses of the other. Re-Freeze pops Purple Bloons and Laser Cannon pops White Bloons.

Middle Path (Dartling Gunner)[]

First Second Synergy
050-DartlingGunner
M.A.D.
005-WizardMonkey
Prince of Darkness
  • The M.A.D. does exceptionally well against MOAB-class bloons, dealing 550 damage to MOABs per missile, but struggles to stop super ceramics, as missiles only deal 3 damage to non-MOABs on contact. This is due to only dealing a measly 3 damage to non MOAB-class bloons, shooting slower than Rocket Storm, and having more spaced rockets. Prince of Darkness can effectively cover this weakness by soaking up Super Ceramics with its undead bloons making this pair perfect for each other.

Bottom Path (Dartling Gunner)[]

Wizard Monkey[]

Top Path (Wizard Monkey)[]

Middle Path (Wizard Monkey)[]

Bottom Path (Wizard Monkey)[]

Super Monkey[]

Top Path (Super Monkey)[]

First Second Synergy
300-SuperMonkey
Sun Avatar
002-MonkeyVillage
Monkey Commerce
  • Sun Avatar is the most expensive tower to be discounted by Monkey Commerce, making it extremely effective at saving money.

Middle Path (Super Monkey)[]

Bottom Path (Super Monkey)[]

Ninja Monkey[]

Top Path (Ninja Monkey)[]

First Second Synergy
400-NinjaMonkey

Bloonjitsu

400-Alchemist

Stronger Stimulant

  • Bloonjitsu greatly benefits from Alch buffs, as each shuriken fired benefits from the buff to pierce and damage.
  • Stronger Stimulant improves its reliability against mid-game.
030-NinjaMonkey

Shinobi Tactics

  • While not as much of an amplification compared to Grandmaster, Bloonjitsu pairs well with Shinobi Tactics to maximize attack speed and pierce.

Middle Path (Ninja Monkey)[]

Bottom Path (Ninja Monkey)[]

First Second Synergy
004-NinjaMonkey
Sticky Bomb
040-TackShooter
Blade Maelstrom
  • This specific combo is highly cost-effective against Bloonarius, especially Elite Bloonarius Tier 1. It pairs consistent single-target damage with high on-demand grouped damage whenever Bloonarius sends "skull" waves.
  • Blade Maelstrom compensates for Sticky Bomb's inherent weaknesses to single-target blimps by handling large waves of bloons at once. And while Sticky Bomb's Flash Bomb is unreliable for stunning, the brief stun spaces the waves of Ceramics a little bit, which incidentally adds a bit more area where the blades can reach at faraway bloons. That being said, tightly packed bloons are often better, but timing will not have to be as important in that case.


Alchemist[]

Top Path (Alchemist)[]

First Second Synergy
500-Alchemist
Permanent Brew
040-HeliPilot
Support Chinook
  • Selling the Permanent Brew Alchemist will remove the Permanent Brew buff from all affected towers. Support Chinook allows you to relocate the Alchemist to affect more towers that it couldn't reach from its initial placement radius.

Middle Path (Alchemist)[]

First Second Third Synergy
Total Transformation

Total Transformation

003-Druid

Druid of Wrath

004-Druid

Poplust

  • With the Druids of Wrath in range of the Transformation ability and (preferably, because not all Druids of Wrath might be in range) 5 Poplust to buff the Druids of Wrath, this trifecta can trivialize Round 95, 98, and 99 pretty easily when the ability is pressed due to the fact that the buffs from the Poplust carry over into the transformation. And unlike Plasma Monkey Fan club, this synergy can still hold its own when the ability is inactive provided it has the support to combat D.D.Ts effectively.

Bottom Path (Alchemist)[]

Druid[]

Top Path (Druid)[]

First Second Third Synergy
300-Druid
Druid of the Storm
004-Druid
Poplust
ObynGreenFootPortrait
Obyn Greenfoot
  • Druids of the Storm synergize well with Obyn through the many buffs he provides, including his Level 9 buff to damage versus MOAB-Class Bloons. A small army in range of the Hero can defend against the early late-game like Round 81. When combined with Poplust Druids, their overall damage is increased considerably and can defend against Round 100+.

Middle Path (Druid)[]

First Second Synergy
050-Druid

Spirit of the Forest

MOAB Crippler

Cripple MOAB

  • Spirit of the Forest deals constant damage to bloons with its vines on the track. Because of this, Cripple MOAB is perfect for keeping the bloons in place with its infinite range stun. This keeps blimps in place for as long as possible and can maximize the time the vines are damaging the bloons. It also comes with a damage debuff to blimps causing the vines to deal even more damage while they are stunned.

Bottom Path (Druid)[]

First Second Third Synergy
Avatar of Wrath

Avatar of Wrath

004-Druid

Poplust

ObynGreenFoot

Obyn Greenfoot

Obyn greatly increases the pierce of the bottom path druids' projectiles. This overcomes the pierce weakness of Bottom Path druids and allows them to make maximal use of their scaling attack speed (and in the case of the Avatar of Wrath, damage) against large rushes of bloons. Plus getting more Poplust druids makes Avatar of Wrath near unstoppable for a long time.

Banana Farm[]

Top Path (Banana Farm)[]

First Second Synergy
BTD6 Banana Farm
Banana Farm
(Any, but Top Path preferred)
040-EngineerMonkey

Overclock

  • Overclocked Banana Farms have increased income generation (How does it increase income generation?). This works best with top path Banana Farms (Tiers 4 or 5), followed by bottom path Farms (Tiers 4 or 5). It's much less efficient on Tier 3 Farms and Tier 4 or 5 middle path Farms.
  • The duration of Overclock is based on the tier of the tower when the buff was applied to it. Overclock will generate more extra income if you buff a Tier 1 farm and then upgrade it.

Middle Path (Banana Farm)[]

Bottom Path (Banana Farm)[]

Spike Factory[]

Top Path (Spike Factory)[]

First Second Synergy
300-SpikeFactory
Spiked Balls
300-Alchemist
Berserker Brew
  • Spiked Balls attacks slow enough that it gains effectively a +2 damage buff to Ceramics and above, and does a decent job at tanking bloons weaker than Ceramics with a +1 damage buff from the brew alone.
  • Acidic Mixture Dip adds bonus Ceramic+ damage, and because Spiked Balls usually attacks slow enough to sustain more buffs than it wears out, Spiked Balls has full uptime with this buff.
  • Like many optimal Alch buff synergies, Spiked Balls appreciates from the pierce and attack speed buffs too. The attack speed in particular allows for better refreshment of spike piles.
  • Unlike most Alch buff synergies, Spiked Balls tends to prefer multiple Berserker Brews than half as many Stronger Stimulants, as the first-mentioned is more cost-effective at applying buffs, given that Stronger Stimulant's separate AMD buff is no different compared to Berserker Brew.

Middle Path (Spike Factory)[]

Bottom Path (Spike Factory)[]

First Second Synergy
Perma-Spike
Perma-Spike
400-SniperMonkey
Maim MOAB
  • Maim MOAB stuns MOAB-class bloons (besides the BAD of course), giving Perma-Spike more time to produce its deadly spikes.
  • Note that other stunning towers can serve the same purpose, maybe even better because of the high damage of maim moab, which means that it beats moabs quite fast.
200-Alchemist
Acidic Mixture Dip
  • For a very low cost, Acidic Mixture Dip adds lead-popping power for Perma-Spike. This specific synergy is important due to Perma-Spike's very low attack speed but high pierce, which allows it to consistently sustain lead-popping power and therefore be able to tank DDTs.
  • This specific synergy can also be applied to Berserker Brew and Stronger Stimulant, which can be upgraded from an existing Acidic Mixture Dip Alch to add extra attack speed.

Monkey Village[]

First Second Synergy
BTD6 Monkey Village
Monkey Village(and it's upgrades)
040-EngineerMonkeyOverclock
  • When overclocked, the Monkey Village gets a noticeable increase in its influence radius, allowing even more towers to fit inside its range which is important for the strength of the Monkey Village.
  • The range boost is especially important for Monkeyopolis because when overclocked, the Monkey City's range allows for more Farms to become sacrificed upon upgrading into Monkeyopolis.

Top Path (Monkey Village)[]

Middle Path (Monkey Village)[]

Bottom Path (Monkey Village)[]

Engineer Monkey[]

Top Path (Engineer Monkey)[]

First Second Synergy
500-EngineerMonkey

Sentry Champion

040-MonkeyVillage

Call To Arms

(Homeland Defense, if afforable)

  • Call to Arms increases both the number of sentries spawned by the Sentry Champion and the attack speed of the sentries' plasma attacks. It also inherits camo detection to use that noticeable increase in DPS against D.D.Ts.

Middle Path (Engineer Monkey)[]

Bottom Path (Engineer Monkey)[]

First Second Synergy
004-EngineerMonkey

Bloon Trap

030-BombShooter

MOAB Mauler

  • MOAB Maulers do high damage to MOAB class bloons, but struggles against the Ceramics bloons inside, which is where the Bloon Trap comes in for the Cercamic clean up. Bloons Traps also give you money when emptied that you can spend on more MOAB Maulers or Bloon Traps.
First Second Synergy
005-EngineerMonkey
XXXL Trap
004-Alchemist
Rubber to Gold
  • When Rubber to Gold affects a blimp, it will further boost the money granted by XXXL Trap, making it a solid income choice for the early 80s.

Quincy[]

Notable synergies with Quincy are listed in this section.

First Second Synergy
QuincyPortrait
Quincy
300-Alchemist
Berserker Brew
  • Quincy benefits from Alch buffs quite well, especially from Level 6+ where he gains a second arrow per shot. This is because brews provide extra pierce, damage, and attack speed, of which these three attributes of the buff amplify his damage output appreciably.
400-Alchemist
Stronger Stimulant
  • Provides a much more reliable buff than 3-0-0, but essentially the same reasoning as 3-0-0 except with higher uptime, for roughly 100% assuming Rapid Shot is not active.

Gwendolin[]

TBA

Striker Jones[]

First Second Third Synergy
StrikerJonesPortrait
Striker Jones
030-BombShooter
MOAB Mauler
002-MonkeyVillage
Monkey Commerce
  • MOAB Maulers have extreme synergy with Striker Jones, receiving various buffs that improve its MOAB-class popping power.
  • However, it is quite expensive to place a lot of these as the optimal crosspthing for the Maulers is also the most expensive for Bomb Shooter. This makes Monkey Commerce perfect for saving cash on a lot of Maulers especially since you can place more than one.
040-BombShooter
MOAB Assassin
N/A
  • Striker's Artillery Command resets ability cooldowns for all Bomb Shooters and Mortar Monkeys, including MOAB Assassin. This allows a large group of Assassins to deal higher overall single-target damage whenever needed.
  • Level 20 Striker's Artillery Command also doubles resetted Assassin abilities if activated within the 10-second duration.
050-BombShooter
MOAB Eliminator
N/A
  • Like MOAB Assassin, except MOAB Eliminator's ability is quite short and already packs a huge punch against single-targets. Rather, the best synergy with MOAB Eliminator here is with Level 20 Striker Artillery Command, which doubles resetted Eliminator abilities, and therefore make the Round 100 BAD's outer layer trivial to destroy.
  • MOAB Eliminator with Striker actually pairs very well with Cluster Bomb spam, especially when paired with Primary Expertise that Clusters also benefit hugely off that Elim can benefit hugely from too for other reasons, specifically the faster ability cooldowns.
003-BombShooter
Cluster Bombs
  • Cluster Bombs work remarkably well with Striker Jones for similar reasons to MOAB Mauler, but this time because of adding important attack speed benefits. Compared to Recursive, spamming Clusters is cheaper overall and synergizes with other external benefits such as Primary Mentoring, similar to Maulers.
  • Cluster Bombs do not work very well for spaced blimps compared to Maulers, but this is compensated by their high grouped damage towards weaker bloons.
  • Unlike synergies with Recursive or Maulers, Cluster Bomb spam tends to prefer Primary Expertise in combination with Striker, due to its much higher synergy overall with Expertise buffs. Otherwise, synergy value with Striker for Clusters is fairly similar to that for Maulers or Recursives, with only its strategical role differing.
  • Striker can also stun stronger blimps to make it a little easier for Cluster Bombs to handle them.
004-BombShooter
Recursive Cluster
  • Recursive Clusters also pack huge synergy with Striker Jones, but mainly in their role at densely packed damage. While expensive, Recursive Clusters have decent MOAB-class popping power.
  • His attack speed buffs also benefit Recursive the same way that it helps Mauler spam. A particular benefit is that the higher attack speed allows the powerful recursive explosions to occur more often.
050-MortarMonkey
Pop and Awe
  • Pop and Awe's best synergy is Striker Jones, especially with his Artillery Command ability that also resets cooldown for Pop and Awe's ability. This makes Pop and Awe much more reliable at global stunning.
  • Prior upgrades to Pop and Awe are affected by his earlier buffs, notably extra attack speed and bigger blast radius, helping to save well till Pop and Awe.
  • His Concussive Shell assists Pop and Awe to trigger Pop and Awe's +10 stunned damage, for even more damage.
400-BombShooter
Bloon Impact
  • Like MOAB Maulers, Bloon Impact is highly improved with Striker Jones thanks to providing better attack speed and lowering resistance to Black Bloon properties.
  • Bloon Impact's strength is mostly in the late-game against Super Ceramics, paired with Mauler spam to basically permastun Super Ceramics in place.
Most explosive options
  • Any tower with an attack whose default damage type is Explosion Explosion Type (pops White, Purple, Lead, Frozen) will benefit from his Level 5+ and 19+ buffs, which reduce Black Bloon resistances to explosives.

Obyn Greenfoot[]

Captain Churchill[]

...

Benjamin[]

banks

Ezili[]

...

Pat Fusty[]

...

Adora[]

...

Admiral Brickell[]

First Second Synergy
AdmiralBrickellPortrait
Admiral Brickell
040-MonkeyAce
Ground Zero
  • Ground Zero synergizes well with Admiral Brickell when paired with her Mega Mine. Her Mega Mine causes a huge amount of damage to strong blimps, while Ground Zero can be chained closely to clean up the rest of the bloons.
300-MonkeyBuccaneer
Destroyer
  • Brickell's Naval Tactics ability is very strong synergy with Destroyer, especially the 3-1-0 Destroyer, empowering the many grapes shot.
  • Destroyer's synergy with Brickell empowers even more at higher levels. Level 5+ gives more pierce in addition to popping any bloon type, and Level 8+ gives a permanent passive +1 pierce.
  • The main parts where Destroyer helps synergize with Brickell is in the case of destroying high-HP targets quickly while Brickell chips away damage onto many more groups of weaker bloon targets with her mines.

Etienne[]

="header" width="200" |First

Second Synergy
EtiennePortrait
Etienne
BTD6 Camo Bloon
Any tower that can't detect camo bloons
  • Towers that can't detect camo synergizes well with Etienne because when he is at level 8+ he gives all monkeys on-screen camo detection. This is powerful with towers such as tack shooters because all of them can now pop camo bloons without a 0-2-0 village.

Sauda[]

Alchemist to allow popping of leads.

Psi[]

First Second Synergy
PsiPortrait
Psi
040-MonkeyAce
Ground Zero
  • Ground Zero synergizes well with Psi to counter the mid-game, as well as reduce overdependence on Psi's Psionic Scream in the late game.
  • Ground Zero can also allow Psi to attack bloons they previously couldn't by reducing the layer to the point in which Psi can attack the bloons. This is most notable with MOAB-class bloons.
005-SpikeFactory
Perma-Spike
  • Perma-Spike is designed to tank bloons in a rather large scale. In combination with Psi taking down a large amount of RBE on screen, they make a great synergy with Perma-Spike, especially once reaching Level 14+ to take down MOABs and Level 16+ against BFBs.
  • Perma-Spike can take care of the DDTs and BADs, as well as tank various Super Ceramics that may go past Psi, which covers against Psi's general weaknesses in the late-game.

Geraldo[]

First Second Synergy
GeraldoPortrait
Geraldo
004-TackShooter
Overdrive
  • Geraldo synergies with Tack Shooter extremely well, with Sharpening Stone improving pierce and damage at Level 15, and Pickle Jar increasing damage.
  • Since Overdrive has only one damage and two pierce, Sharpening Stone multiplies pierce by 150% and later damage by 200%.
  • Pickle Jar increases damage by 200% but decreases attack speed by 80%, which multiplies to be 160%. It's not worth it getting Pickle Jar if Overdrive already has 4 damage, unless you're getting it for the extra fortified damage.
300-SuperMonkey
Sun Avatar
  • Geraldo synergies with Sun Avatar extremely well, with an option to permanently transform an existing Dart Monkey into a Super Monkey via Worn Hero's Cape, and Pickle Jar increasing damage.
  • Worn Hero's Cape is very good for placing Super Monkeys including Sun Avatar inside tight spaces. What makes Sun Avatar stand out from other Super Monkey options is its high synergy potential and maximum DPS for the Tier 3 restriction provided by the cape.
  • Pickle Jar increases damage by 200% but decreases attack speed by 80%, which multiplies to be 160%. It's not worth it getting Pickle Jar if Sun Avatar already has 4 damage, unless you're getting it for the extra fortified damage.
040-SniperMonkey
Supply Drop
  • One of Geraldo's best synergies is Supply Drop. Many of his items are compatible with Supply Drop, including Rejuv Potion and Sharpening Stone in particular.
  • The Rejuv Potion is the strongest synergy for Supply Drop paired with Geraldo. Multiple of them can be used in conjunction to produce a giant boost in cash gain.
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