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Heavy shells do extra damage to Ceramic, Lead, all Fortified, and all stunned bloons. Can also pop Black Bloons.
~ In-game description

Heavy Shells is the third upgrade of Path 2 for the Mortar Monkey in Bloons TD 6. It allows the mortar to pop Black Bloon properties as well as deal +1 damage to all Fortified, +1 damage to all Leads (including visible DDTs), +3 damage to Ceramic Bloons, +1 damage to MOAB-class, and +2 damage to stunned bloons.

It costs $765 on Easy, $900 on Medium, $970 on Hard, and $1,080 on Impoppable.


With the Heavy Shells upgrade, it changes the appearance of both the monkey and the mortar cannon. The monkey is now an officer in a green military-style shirt and green beret, paired with a black-barreled mortar cannon with two yellow stripes around it. The monkey stands by its barrel to continually press buttons on its handheld remote, instead of pushing a ground-level lever. In the official artwork, the monkey points with its left index finger.



Updated as of Version 29.4
Easy Medium Hard Impoppable
Upgrade Cost (x-3-x) $765 $900 $970 $1,080
Total Cost (0-3-0) $TBA $2,450 $TBA $TBA
Total Cost (1-3-0) $TBA $2,950 $TBA $TBA
Total Cost (2-3-0) $TBA $3,600 $TBA $TBA
Total Cost (0-3-1) $TBA $2,650 $TBA $TBA
Total Cost (0-3-2) $TBA $3,150 $TBA $TBA


Heavy Shells is quite expensive for a single tower with moderately slow attack speed and low accuracy, but it becomes a good low-cost option at countering early Ceramics, as well as good support at destroying groups of Black Bloon layers in earlier rounds. In addition, it has a unique synergy with stun attacks by dealing more damage to bloons inflicted by a stun status effect. Similar to most Mortar Monkeys, targeting Heavy Shells along bends will optimize the accuracy of its explosive attacks.

Heavy Shells is usually a stepping stone to Artillery Battery in most cases, but it does a good job as a stepping stone compared to other upgrade alternatives, due to being able to damage any non-camo bloon type, having global range potential, and possessing decent pierce.


Version History[]

Additional specialization is given to Heavy Shells to reduce the Mortar Monkey's general blimp weaknesses and increase synergy possibilities, and these buffs have passed on to subsequent upgrades at different extents.

  • Buff Heavy Shells with Burny Stuff will now (correctly) add Burny Stuff to Black Bloons.
  • Buff Heavy Shells now deals +1 damage to MOAB-class.
  • Buff Heavy Shells now deals +2 damage to stunned bloons.
  • Nerf Explosion random deviation radius increased (18 → 30).
  • Nerf Attack speed decreased (1.07s → 1.08s), due to Mortar Monkey attack speed reworks.
  • Buff Reverted random deviation radius change.


Official artwork[]


  • There is used to be a bug where a 0-3-2 Mortar Monkey could not apply napalm to Black Bloons despite the Heavy Shells upgrade allowing to pop Black Bloons. This was fixed on Version 7.0; Black Bloons popped by a 0-3-2 Mortar Monkey will now turn into Pink Bloons with the Burny Stuff effect instead of without the Burny Stuff effect.
  • Prior to Version 17.0, the description was "Heavy shells do extra damage to Ceramic, Lead, and all Fortified Bloons. Can also pop Black Bloons." but was changed because of the added bonus stunned bloon damage mechanic.
  • Heavy Shells and its subsequent upgrades were formerly the only towers to specifically deal extra damage to Lead Bloons, until Lead to Gold and its further upgrades received a lead damage buff in Version 23.0.
    • However, a submerged 4-2-0 Monkey Sub does +1 damage to Leads since Version 18.0.
  • Heavy Shells and its subsequent upgrades were formerly the only towers to deal more damage to stunned bloons, but this is no longer the case after Sauda was released; her Level 6+ upgrade allows her to deal more damage to stunned bloons.