Bloons Wiki
Bloons Wiki

Devastating explosions pop 7 layers of bloon, plus increases Burny Stuff damage further.
~ BTD6 description

The Big One is the fourth upgrade of Path 1 for the Mortar Monkey in Bloons TD 6. It increases the blast radius by +50% (40 to 60 for main explosion, 20 to 30 and 60 to 90 for the secondary shockwave), damage of the main explosions from 2 to 7, pierce of the main explosion and shockwaves from 45 to 85. Unlike BTD5, The Big One comes with secondary shockwaves (from Shell Shock that stun affected bloons for 0.5s, or extra damage if further from the main explosion). Both the main explosions and the secondary shockwaves can pop Black Bloons regardless of upgrades. With Burny Stuff, the damage per tick increases from 2 to 5, and retains a burn rate of every 0.625s for 1.875 seconds.

It costs $6,800 on Easy, $8,000 on Medium, $8,640 on Hard and $9,600 on Impoppable.


The Big One upgrades the mortar cannon into a much bigger mortar cannon that shoots black artillery shells, presumably a nuclear-infused shell. The mortar cannon is yellow with thin green bands, and the mortar cannon has a very thick and wide barrel. At the front and back of the barrel, radioactive symbols appear on both sides. The operator now wears a full bodysuit, patterned black with a wide yellow stripe (wide red stripe with 4-0-2 crosspath) at the center of it. Aside from the pattern, this bodysuit is very similar to Glue Hose, which also has a pair of green lenses for the eyes. He continues to wear the same gloves as Shell Shock. In the official upgrade portrait, the operator is looking ahead after launching a shell from the mortar cannon.

Full Popology[]



Damage Types[]



Updated as of Version 30.2
Easy Medium Hard Impoppable
Upgrade Cost (4-x-x) $6,800 $8,000 $8,640 $9,600
Total Cost (4-0-0) $9,055 $10,650 $11,500 $12,780
Total Cost (4-1-0) $9,310 $10,950 $11,825 $13,140
Total Cost (4-2-0) $9,735 $11,450 $12,365 $13,740
Total Cost (4-0-1) $9,225 $10,850 $11,715 $13,020
Total Cost (4-0-2) $9,650 $11,350 $12,255 $13,620



The Big One is a rather expensive tower, but it is a good option for dealing big damage to grouped bloons, as well as a fair amount of damage to early MOABs. It is mostly used on maps where unlimited-range crowd control is required, or if planning to purchase The Biggest One later on in the game. Compared to Artillery Battery, which is better against MOAB-class, The Big One is far superior against grouped regular bloons, and particularly Ceramics on pre-freeplay rounds.

Crosspathing choice for The Big One depends on its long-term role. Adding the Rapid Reload crosspath lets the Mortar create explosions at a faster rate, damaging and stunning bloons more often and simply dealing more damage per second. However, Burny Stuff gives The Big One with higher raw DPS, having a significant effect against dense groups of bloons touched by its napalm because the damage-over-time from the Burny Stuff crosspath can quickly disintegrate affected bloons. Both crosspaths favor supports and proper positioning in order to maximize their true damage potentials.


  • The Big One is a great option for midgame due to its cheap price. It is mainly specialised against bloons, and tends to be good on Rounds like 63, 76 and 78.
    • Due to its bloon specialisation it is highly recommended to bring other DPS with decent MOAB popping power such as Arcane Spike or Quincy.
  • During Round 81+, when superceramics begin to spawn, it stops being a solo DPS tower. While retaining passable damage its role shifts towards that of stalling superceramics with its stun.
  • Infinite range, being able to negate Line of Sight, and manoeuvrability are some notable benefits of using The Big One. It benefits especially on maps with large rounded bends such as Moon Landing or Spillway.
  • With the Mortar Monkey reworks on Version 21.0, 28.0, and 30.0, 4-2-0 will have an easier time hitting bloons, as well as applying stuns with more frequency; however, 4-0-2 will have a great DPS advantage when against ceramics, or a dense clump of bloons.

Version History[]

Balance Changes[]

The Big One has overall been buffed, attributed the price decrease and increased blast radius. It received a damage buff in Version 30.0 to improve its bloon-popping power in competition to Artillery Battery, and also received various burning buffs in the past to make the 4-0-2 crosspath actually viable.

  • Buff The Big One cost reduced ($10,000 → $8,000).
  • Buff The Big One blast radius increased.
  • Buff The Big One will now (correctly) damage DDTs when given camo detection.
  • Nerf Explosion random deviation radius increased (18 → 30).
  • 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 4-0-2 The Biggest One's Burny Stuff effect deals more damage (1 → 3).
  • Buff Reverted random deviation radius change.
  • Buff 4-0-2 indirectly affected by Burny Stuff rework, increasing tick rate and total damage of the improved burn damage
Mortar top path feels too weak for the lead up to the Tier 5, so it along with the T5 have had some general number increases. 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
  • Buff The Big One main explosion damage increased (5 → 7)
  • Buff Burny Stuff damage over time increased from 3 → 5 when used as a Big One crosspath
  • Buff 4-0-2 The Big One napalm burns twice as fast but also lasts twice as short
  • Buff [undocumented] 4-0-2 The Big One napalm with Extra Burny Stuff burns faster (1.0s --> 0.375s)

Bug Changes and General Changes[]

  • Change Changed from "Devastating explosions pop 5 layers of bloon." to "Devastating explosions pop 5 layers of bloon, plus increases Burny Stuff damage further."
  • Change Corrected "5" to "7" to accommodate new description


Official artwork[]



  • The artwork for The Big One does not feature the radioactive symbol on the thick mortar barrel, but the in-game model does.
  • In the game's files, the upgrade icon for The Biggest One is named "TheBIgOneUpgradeIcon.png" with a capital l - possibly a typo.
  • The upgrade icon for The Big One shows destroyed parts of a red, blue, green and zebra bloon, and fortified bands flying off from the explosion. not only is both the pink and white/black layer missing, but fortified zebra bloons both do not exist in BTD6, and would not be able to be popped by a single explosion from The Big One, as it deals only 7 damage. While the Big One was buffed to fully pop a regular zebra bloon, taking exactly 7 damage, the fortification removal is inaccurate.
  • Although Version 30.0 buffed The Big One's damage, the description was not corrected until version 31.0.