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Damaged Bloons are set ablaze momentarily with each hit.
~ In-game description

Burny Stuff is the second upgrade of Path 3 for the Mortar Monkey in Bloons TD 6. All bloons damaged by the Mortar Monkey with Burny Stuff will be set on fire, dealing 1 damage every 1.25s for 3.75 seconds, for a total of 3 damage. Unlike BTD5, the Mortar Monkey cannot apply napalm to Black Bloons or Zebra Bloons unless the Mortar can damage them (e.g. upgrading to Heavy Shells, adding MIB, or having Striker Jones Level 5+).

Burny Stuff improves its napalm damage-over-time with Path 1 crosspathing. Starting from 3-0-2, burning effects are twice as fast but last twice as short, damaging at a rate of every 0.675s over 1.875s. Burn damage also increases to 2 with Shell Shock (6 total damage), 5 with The Big One (15 total damage), and 25 with The Biggest One (75 total damage). Duration of the Burny Stuff's status effect and the rate of damage ticks both remain otherwise the same with crosspathing, but damage ticks rate increases by 0.25s by having Extra Burny Stuff.

This upgrade costs $425 on Easy, $500 on Medium, $540 on Hard, and $600 on Impoppable.



Upgrading to Burny Stuff adds a fiery design to the barrel and to the Mortar Monkey's hat, which is now red.



Targeting Priorities[]

Mortar Monkey has only one target priority, "Set Target". This allows the Mortar Monkey to land shells within anywhere inside the target reticle. Tapping on the "Set Target" button prompts the player to change the target position of where the Mortar Monkey will land its shells. By default, once the Mortar Monkey is bought, the Mortar Monkey's target reticle is placed near the start of the first bloon track.


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-X-2) $425 $500 $540 $600 -
Total (0-0-2) $1,230 $1,450 $1,565 $1,740 $861 $1,015 $1,096 $1,218
Crosspath (1-0-2) $1,655 $1,950 $2,105 $2,340 $1,159 $1,365 $1,474 $1,638
Crosspath (2-0-2) $2,080 $2,450 $2,645 $2,940 $1,456 $1,715 $1,852 $2,058
Crosspath (0-1-2) $1,485 $1,750 $1,890 $2,100 $1,040 $1,225 $1,323 $1,470
Crosspath (0-2-2) $1,910 $2,250 $2,430 $2,700 $1,337 $1,575 $1,701 $1,890

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



Burny Stuff helps the Mortar Monkey deal additional early-game damage, similar to its role in earlier games. The damage-over-time effect is faster but lasts shorter and deals less overall damage, but it remains somewhat usable against early grouped bloons and early Lead Bloons. Often, it can be difficult to spread the Burny Stuff effect since the base Mortar has a low reload speed and small blast area.

Burny Stuff may face competition from other crosspaths, as its damage over time cannot be stacked while upgrades like Bloon Buster increase damage at a significant amount while Faster Reload and Rapid Reload provide attack speed.


  • For an early-game Burny Stuff, 0-2-2 is generally better than 2-0-2, as the Burny Stuff explosions can be applied more reliably by hitting the same location at a higher rate, while 2-0-2 is noticeably slower that the bigger blasts make not much difference to catching bloons better.
  • When paired with tier 3 and above for the top path, the Burny Stuff crosspath gives the mortar a great DPS boost, mostly against regular bloons, due to the burn effect piercing multiple layers; it also gives a decent DPS boost against blimps, especially with The Biggest One.
    • The disadvantage of not using the Rapid Reload crosspath is not improving stun frequency, and not getting an easier time hitting bloons, the latter can be mitigated on certain track spots, or by using slowing effects, for example.
    • These upgrades can both stun and deal high damage, although with less effective stun potential compared to getting Rapid Reload.
    • Note that the napalm effect only applies to its main explosion and not to its secondary explosions.
  • Crosspathing Burny Stuff with Heavy Shells, Artillery Battery or Pop and Awe is not very useful, because it competes with Bigger Blast and Bloon Buster and due to the small amount of extra damage it does compared to crosspathing with the other path, since the increased attack speed of Artillery Battery cannot stack Burny Stuff beyond its base rate.

Version History[]

Balance Changes[]

Adjustments primarily made for encouraging crosspathing other than Path 2. The damage per tick buff in Version 21.0 was done to balance out Upper Path 1 crosspathing, diverging those upgrades into a damage-oriented role rather than optimal stunning.

There is also the Version 28.0 rework buff of Burny Stuff to last longer while also damaging faster too, which is a straight buff to DPS.

6.0 (Mortar Monkey update)
  • Nerf Burny Stuff no longer applies napalm onto Black Bloons or Zebra Bloons.
  • Buff Attack speed without Path 2 upgrades increased (2.2s → 2.0s).
  • Buff Attack speed with Faster Reload increased (1.54s → 1.5s).
  • Nerf Attack speed with Rapid Reload decreased (1.07s → 1.08s).
  • Buff Burny Stuff damage now increases with Upper Path 1 upgrades.
  • Change Description changed from "Sets Bloons on fire with each hit." to "Damaged Bloons are set ablaze momentarily with each hit."
Bottom path Mortar burns have been reworked to burn faster and last longer at all upgrades; the Extra Burny Stuff MK has been tweaked in order to keep it's [sic] benefit the same comparatively to the new & improved base values.
~ Ninja Kiwi
  • Buff Burny Stuff DoT duration increased from 3s -> 3.75s
  • Buff Burny Stuff DoT tic interval reduced from 1.5s -> 1.25s
  • Nerf MK: Extra Burny Stuff buff amount reduced 0.5s -> 0.25s
    • Change Overall burn rate remains the same for all paths
[...] Additionally the 302 crosspath has failed to ever see a great deal of use compared to much faster firing, to make it easier to to use up power from the DoT this path will now burn through faster
~ Ninja Kiwi, referring to 3-0-2 crosspath Burny Stuff
  • Buff Napalm from 3-0-2 and above upgrades burns twice as fast but also lasts twice as short


  • [unknown update] Upgrading the Mortar Monkey to 0-1-2 will produce the Bigger Blasts Burny Stuff explosion sprite instead of the normal Burny Stuff explosion sprite. 0-2-2 fixes this visual issue.

currently none?


Official artwork[]


  • Upgrading to this upgrade turns the mortar shells orange-red, and explosions turn orange-red too. In BTD5, adding Burny Stuff made the explosions very red.
  • In BTD6, a Heavy Shells with Burny Stuff could not affect Black Bloons until Version 7.0, when it got fixed.
  • In BTD6, the description for Burny Stuff was incorrect until Version 24.0. Although its old description claimed that bloons would be set on fire on "each hit", they only set on fire if bloons are damaged. So a Black Bloon can be "hit" by a Mortar Monkey, but it will not be affected by it. Version 24.0 makes the description factually correct again, albeit a bit more wordy.