Bloons Wiki
Bloons Wiki

Sub's darts can pop an additional 3 bloons each.
~ 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 70, and gives +20 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.



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 +20 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.


Updated as of Version 32.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.
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.png Military Conscription, AdvancedLogisticsIcon.png Advanced Logistics, BetterSellDealsIcon.png 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.


  • This upgrade increases pierce, allowing for better popping power. It is usually just a stepping stone to higher upgrades.
  • 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.

Version History[]

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 limited pierce bonus for Upper Path 1 Sub decamo pulses instead of leaving them at infinite pierce.


Official artwork[]




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