Heavy shells do extra damage to Ceramic, Lead, all Fortified Bloons, and all stunned bloons. Can also pop Black Bloons.
~ BTD6 description as of Version 17.0


Heavy Shells is the third upgrade of Path 2 for the Mortar Monkey in BTD6. It allows the mortar to pop black bloons as well as deal +1 damage to all Fortified, +1 damage to all Leads (including 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.

Appearance[edit | edit source]

With the Heavy Shells, 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. In the official artwork, the monkey points with its right index finger.

Strategy[edit | edit source]

Summary[edit | edit source]

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, global range potential, and decent pierce.

Tips[edit | edit source]

Version History[edit | edit source]

7.0

Buff.png Heavy Shells with Burny Stuff will now (correctly) add Burny Stuff to Black Bloons.

8.0

Buff.png Heavy Shells now deals +1 damage to MOAB-class.

17.0

Buff.png Heavy Shells now deals +2 damage to stunned bloons

21.0
  • Nerf.png Explosion random deviation radius increased (18 --> 30)
  • Nerf.png Attack speed decreased (1.07s --> 1.08s), due to Mortar Monkey attack speed reworks
22.0
  • Buff.png Reverted random deviation radius change

Gallery[edit | edit source]

Trivia[edit | edit source]

  • 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.
  • Heavy Shells changes the Mortar Monkey's activation process into pressing a button on a special handheld remote instead of a ground-level lever.
  • 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.
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