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Synergies or Tower Combos are combinations of two or more towers that are extremely effective at damaging bloons, garnering income, or some other directed task. As opposed to amassing a large number of towers, or simply lavishing a single tower with buffs, synergies are usually characterized by high cost efficiency, good coverage of different damage needs (such as single target damage and grouped popping power), and 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 accumulate 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 most dense 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 crosspathing, assume that all towers stated have no crosspaths other than the upgrade that is being stated. (X-0-0, 0-X-0, and 0-0-X)
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 (e.g. 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".
Player Strategies! The following combinations are based on player opinions and may, therefore, not be entirely objective. Feel free to add or modify any strategies you see fit.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Like 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.
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.
Path 3 (Tack Shooter)
The Tack Zone
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.
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.
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.
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.
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.
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.
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.
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.
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.
Apache Prime's missiles and red lasers do not damage DDTs due to the fact that DDTs are immune to explosions and Energy-type lasers respectively, meaning that the only damage that the Apache Prime is doing to them via its machine gun with Plasma damage and rotors with Normal-type damage. MIB solves this by making all attacks done by Apache Prime effectively Normal , allowing all of them to brute force through all immunities of the DDTs. MIB even comes with camo detection inherited from Radar Scanner.
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.
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.
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.
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.
The M.A.D. does exceptionally well against MOAB-class bloons, dealing 750 damage per missile, but struggles to stop super ceramics. This is due to only dealing a measly 3 damage to non MOAB-class bloons, shooting slower than Rocket Storm, and rockets are more spaced. Prince of Darkness can effectively cover this weakness by soaking up Super Ceramics with its undead bloons making this pair perfect for each other.
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.
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.
Obyn greatly increases the pierce of the bottom path druids' projectiles. This overcomes the pierce weakness of Path 3 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.
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.
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.
Call to Arms (and Homeland Defense, if affordable) increase 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.
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.
Notable synergies with Quincy are listed in this section.
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.
MOAB Maulers have extreme synergy with Striker Jones, receiving various buffs that improve its MOAB-class popping power.
At earlier levels, the faster attack speed provided by Striker improves Maulers' efficiency against MOABs. At higher levels, spamming enough of them makes them a dominating force against grouped blimps.
His Level 5+ allows Maulers, and other explosives, with a 50% chance to damage DDTs, while Level 19+ makes DDTs completely vulnerable to Maulers. Therefore, MIB is not required for Mauler spam.
Placing Maulers nearby him adds slightly more range and pierce, which makes a small difference against hyperdense rounds.
At Level 20, Artillery Command doubles damage of all Bomb Shooters and Mortar Monkeys on screen, including the extra blimp damage from all Maulers. This provides the ultimate damage boost for Maulers whenever necessary.
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.
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.
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.
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.