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Bloons Wiki

Sub's darts can pop an additional 3 bloons each. Enhances pierce of other weapons.
~ In-game description

Barbed Darts is the first upgrade of Path 2 for the Monkey Sub in Bloons TD 6. It increases pierce of each main dart from 2 to 5. For Airburst Darts, darts still split on impact but each individual airburst dart receives +3 pierce. For Bloontonium Reactors, pierce of the damaging radiation zone increases from 50 to 100, and gives +50 pierce for the decamo pulses of Submerge and Support and above.

This upgrade costs $380 on Easy, $450 on Medium, $485 on Hard, and $540 on Impoppable.



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Barbed Darts

Barbed Darts adds a red arrowhead on the top of the submarine's gun holder. For Submerge Subs and Reactors, the telescopes' lenses become red instead of green.

All darts including those burst from Airburst Darts gain +3 pierce. Base darts have 5 pierce. Armor Piercing Darts instead increases pierce from 5 to 8, while Sub Commander pierce increases from 9 to 12 because it receives its own buff. Reactors and Energizers gain +50 pierce.

Targeting Priorities[]

Barbed Darts targets bloons using the standard targeting priorities. It shoots straight movement projectiles that can moderately seek at bloons.

  • 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.

Adding Advanced Intel does not add Camo Prioritization, despite being a potential option for camo detection.

Full Popology[]


Updated as of Version 42.0
Base stats
  • Dart:
    • Projectile, sharp type, 42 range, 0.7s attack cooldown, 1 damage, 5 pierce. Moderately homes at bloons at a 170 linear speed and 360 angular speed, with a seeking radius of 27.06.
Crosspathing interactions
  • 3-1-0: Submersion gains +20 pierce.
  • 4-1-0: Submersion decamo gains +20 pierce, submersion radiactive attack gains +20 pierce.
  • 0-1-2: Bursted darts have 5 pierce, the main dart has 1 impact pierce.
  • 0-1-4: Bursted darts have 8 pierce, the main dart has 1 impact pierce.
  • 0-1-5: Bursted darts have 12 pierce, the main dart has 1 impact pierce.
Monkey Knowledge interactions
  • NavalUpgradesIcon Naval Upgrades: All Monkey Subs get +1 pierce.
  • EliteMilitaryTrainingIcon Elite Military Training: All Military Monkeys get a one-off +1000 XP and earn XP in-game 5% faster permanently.
  • FlankingManeuversIcon Flanking Maneuvers: Attacks 10% faster when set targeting priority to "Last".
  • MilitaryConscriptionIcon Military Conscription: First military tower costs only ⅔ of the original cost.
    • Monkey Sub base cost from $275, $325, $350, and $390 → $185, $220, $235, and $260 on Easy, Medium, Hard, and Impoppable, respectively.
  • AdvancedLogisticsIcon Advanced Logistics: All Military Monkeys base costs reduced by 5%.
    • Monkey Sub base cost from $275, $325, $350, and $390 → $260, $310, $335, and $370 on Easy, Medium, Hard, and Impoppable, respectively.
      • If Military Conscription is also enabled, the final cost will be $170, $200, $220, and $240.
  • MonkeyEducationIcon Monkey Education: All Monkeys XP earn rate increased by 8%.
  • BetterSellDealsIcon Better Sell Deals: All Monkeys sell for 5% more. Increases sell potency from 70% to 75%.
  • VeteranMonkeyTrainingIcon Veteran Monkey Training: All Monkeys reload time reduced by 3%.

Attack Interactions[]

See also: Attack Interactions/Bloons TD 6/Military
Updated as of Version 34.3
Base attack(s)
  • Dart:
    • Sharp Type (pops Black, White, Purple) Normal
    • Single Projectile Single Projectile
    • Straight Attack Straight Attack
    • Moderate Seeking Moderate Seeking


Updated as of Version 43.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.
[Module | Data] Purchase Sell
Costs Easy Medium Hard Impoppable Easy Medium Hard Impoppable
Upgrade (X-1-X) $380 $450 $485 $540 -
Total (0-1-0) $655 $775 $835 $930 $459 $543 $585 $651
Crosspath (1-1-0) $765 $905 $975 $1,085 $536 $634 $683 $760
Crosspath (2-1-0) $1,190 $1,405 $1,515 $1,685 $833 $984 $1,061 $1,180
Crosspath (0-1-1) $1,035 $1,225 $1,320 $1,470 $725 $858 $924 $1,029
Crosspath (0-1-2) $1,885 $2,225 $2,400 $2,670 $1,320 $1,558 $1,680 $1,869

This upgrade's prices (or included crosspath's prices) are affected by the following MK: MilitaryConscriptionIcon Military Conscription, AdvancedLogisticsIcon Advanced Logistics, BetterSellDealsIcon Better Sell Deals



Barbed Darts will produce more pierce potential overall compared to adding Twin Guns, but for the same cost it doesn't have as much early-game value in comparison. This is because a majority of the issues in early-game come from the faster bloons rather than grouped bloons. However, this upgrade can come in handy when extra dart pierce is necessary. As a crosspath, the Barbed Darts crosspath fulfills extra pierce, helping pop more bloons per shot.


  • This upgrade increases pierce, allowing for better popping power. It is usually just a stepping stone to higher upgrades, but can also be helpful for lasting longer on the map to loop into more bloons.
  • There are some uses out of the 0-1-2 for advancing against grouped rounds. However, in general cases, grouped bloons aren't always a problem and 2-0-2 is better for general cases.
  • 0-1-1 Sub can be helpful for utilizing the homing dart attack.

Version History[]

Balance Changes[]

Mostly implemented crosspath interactions with non-dart attacks.

  • BUFF Heat-Tipped Darts crosspath now gives submerged Bloontonium Reactors with extra pierce.
  • NERF Pierce bonus for submerged Bloontonium Reactors and Energizers decreased (+20% → additive +30; 84 → 70 for Reactors, and 1200 → 1030 for Energizers)
    • Energizer pierce reduction is undocumented in Ninja Kiwi's Version 23.0 patch notes.
Similar types of camo reveal like Shimmer/Signal Flare/Embrittlement are all pierce limited, but the Submerge sub has practically infinite pierce while also being extremely cheap with a very fast rate and a T4 that is far better at camo removal than those other towers can reach. Giving this upgrade a more reasonable pierce value brings these more in line and allows for the pierce crosspath to have some potential meaning.
~ Ninja Kiwi, referring to Upper Path 1 Sub
  • NERF Barbed Darts now adds a +20 pierce bonus for Upper Path 1 Sub decamo pulses instead of leaving them at infinite pierce.
  • BUFF Barbed Darts now gains the full pierce bonuses of the submerge and decamo bonuses that 3+-2-0 crosspaths provided

Bug Fixes and General Changes[]

Extra Notes (Version History)[]

  • Change Added "Enhances pierce of other weapons." to end of upgrade description


Official artwork[]




  • Barbed Darts currently costs the same as the Twin Guns upgrade.