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Every second shot the cluster bombs send out more cluster bombs for even more destruction.
~ In-game description

Recursive Cluster is the Tier 4 upgrade of Path 3 for the Bomb Shooter in Bloons TD 6. It allows the Bomb Shooter's cluster bombs to shoot out more cluster bombs every second shot. Visually on every second shot, all 8 cluster bombs will explode into 8 more cluster bombs, totaling to 64 bombs. But in reality the tertiary explosions are just 8 larger explosions exploding 0.45s later. Every bomb and its clusters from this upgrade can also pop Black Bloon properties.

Recursive bombs work much differently from normal cluster bombs. The primary recursive bomb explosion has a 12 blast radius with 18 pierce. Afterwards, the 8 secondary recursive bomb explosion explode, each having 15 blast radius and 10 pierce. And after 0.45s, 8 tertiary explosions will become produced, each with 34 blast radius and 60 pierce. Crosspathing with Bigger Bombs increases pierce of tertiary explosions by +36 (96 pierce), +6 for secondary explosions, but none for the main explosion. Heavy Bombs increases the pierce amounts from +36 to +60 (120 pierce) for tertiary explosions and another +10 pierce for secondary explosions, alongside +1 damage for all explosions. Blast radius for primary and secondary explosions increases by +50% with Path 1 upgrades, or from 34 to 37.5 for tertiary explosions.

This upgrade costs $2,380 on Easy, $2,800 on Medium, $3,025 on Hard, and $3,360 on Impoppable.



This upgrade is much larger than its predecessor, replacing its gray wheels with a fixed rotating navy blue platform. The cannon's barrel is mostly yellow, with yellow trunnions, two light green reinforce bands, and a light green cascabel. The muzzle and reinforce around the trunnions are axially adorned with extruded dimples.

Path 1 crosspathing paints the front ring, then both rings, dark red.

Path 2 crosspathing adds red fins and paints the green sections grey.


Recursive Cluster causes every second shot to trigger a set of what, visually, are 64 more explosions; in reality these are coded as 8 large explosions occurring 0.45 seconds after impact.

These tertiary explosions individually deal 1 damage with 60 pierce and 34 blast radius.

Bigger Bombs and Heavy Bombs have unique interactions with the tertiary explosions; the former grants +36 pierce and +3.5 blast radius, for 37.5, and the latter grants +1 damage and a total of +60 pierce; however oddly enough the main explosion loses its normal pierce bonuses.

Targeting Priorities[]

Recursive Cluster targets bloons using the standard targeting priorities. It shoots straight movement projectiles.

  • First: Targets the first bloon visible within its range.
  • Last: Targets the last bloon visible within its range.
  • Close: Targets the closest bloon visible within its range.
  • Strong: Targets the strongest bloon visible within its range.


Updated as of Version 31.0. Listed prices exclude buffs, sacrifices, and Monkey Knowledge.
Purchase Sell
Costs Easy Medium Hard Impoppable Easy Medium Hard Impoppable
Upgrade (X-X-4) $2,380 $2,800 $3,025 $3,360 -
Total (0-0-4) $3,930 $4,625 $4,995 $5,550 $2,751 $3,238 $3,497 $3,885
Crosspath (1-0-4) $4,225 $4,975 $5,375 $5,970 $2,958 $3,483 $3,763 $4,179
Crosspath (2-0-4) $4,775 $5,625 $6,075 $6,750 $3,343 $3,938 $4,253 $4,725
Crosspath (0-1-4) $4,140 $4,875 $5,265 $5,850 $2,898 $3,413 $3,686 $4,095
Crosspath (0-2-4) $4,480 $5,275 $5,695 $6,330 $3,136 $3,693 $3,987 $4,431

This upgrade's prices (or included crosspath's prices) are affected by the following MK: BudgetClustersIcon.png Budget Clusters, ComeOnEverybodyIcon.png Come On Everybody!, BetterSellDealsIcon.png Better Sell Deals



The Recursive Cluster is extremely effective at cleaning up regular bloons, and also dealing large amounts of damage to MOAB-class bloons with its numerous explosions. Even just one or two Recursive Clusters can wipe out large amounts of bloons with ease even without crosspath upgrades.

When picking the best Recursive Cluster crosspath, Path 1 is generally preferred over Path 2. Despite Path 2's Faster Reload and Missile Launcher upgrades allowing the Recursive Cluster to shoot much faster, and therefore shoot recursive cluster bombs more often, Path 1's Bigger Bombs and especially Heavy Bombs increase the Recursive Cluster's popping power much more, by increasing explosion radius, pierce, and increasing damage. However, if using Berserker Brew or higher, the DPS of the path 2 crosspath is higher due to damage no longer being a big enough of a boost compared to attack speed, though blast radius is unaccounted for.

If planning to spam Recursive Clusters, using Striker Jones as the chosen hero is one of the best options for optimizing the Recursive Cluster spam. Increased attack speed and pierce are one of many vital assets for Recursive Clusters. In addition, Level 20 Striker Jones maximizes the power of Recursives by doubling their damage. Primary Mentoring also helps save money for the more expensive Bomb upgrades as well as give an appreciable boost at direct range.


  • A 2-0-4 Recursive Cluster is generally preferred over a 0-2-4 Recursive Cluster as the Path 1 upgrades increase its overall popping power much more. 0-2-4 Recursive Cluster works well with buffs such as Berserker Brew, synergizing damage and attack speed stats better at the cost of explosive coverage.
  • Recursive Cluster does a fair job at dealing high damage to both bloons and MOAB-class, but it is quite expensive for what it does compared to other options. However, Recursive Cluster does its job well at creating widespread high-pierce grouped damage.
    • However, if using Striker Jones, Recursive Cluster is actually an excellent option, as he provides global bonus attack speed.
  • A 2-0-4 Recursive Cluster can make Round 63 a lot less difficult, especially with other supporting towers.

Version History[]

Recursive Cluster was overall buffed to become a reliable explosive option at simply wiping out dense clumps of bloons across a wide range. The Version 4.0 buff that allows tertiary explosions to go off more often had made Recursive Cluster one of the first Bomb Shooter upgrades to become viable in meta strategies, seeing that Bomb Shooter was initially very weak when it was first released. It also received a massive buff in Version 28.0 that basically invalidates a moderate price nerf in Version 12.0, given that this black-popping buff now eliminates the Recursive Cluster's initially only weakness.

  • Buff Tertiary clusters appear every second shot instead of every third shot.
  • Description changed from "Every 3 shots the cluster bombs send out more cluster bombs for even more destruction." to "Every second shot the cluster bombs send out more cluster bombs for even more destruction."
  • Nerf Cost of Recursive Cluster increased ($2400 → $2800)
  • Nerf Base primary bomb pierce decreased (18 → 14)
  • Nerf Adding Bigger Bombs adds less pierce bonus for primary, secondary, and tertiary explosions (+10 → +5)
  • Buff Adding Heavy Bombs now adds a pierce bonus for primary, secondary, and tertiary explosions (+0 → +10)
[...] We've acknowledged that Frag Bombs have felt like an inconsistent crosspath both in what they add to the tower and what they lose when upgraded further on their own path, so now in addition to frags popping Black Bloons xx2+ will allow all attacks from the tower to pop Black.
~ Ninja Kiwi


Official artwork[]


  • Before v7.0, the instamonkey icon appeared to have 6 muzzles, though it only has 1 in game, implying the upgrade has gone through a visual change in development. This icon was changed in v7.0.