Sub-Towers are towers that are deployed from the standard Towers and Heroes. They were first introduced in Bloons TD 5 with the introduction of the Planes from the Aircraft Carrier. Many sub-towers can be tapped/click to reveal a menu with their own Pop Count, Sell Button, and Range, like with the Sentries and Marine. However, this is not always the case as demonstrated by the Mini-Comanches and Phoenix. Most sub-towers only last for a limited time and will automatically disappear after some time. Note that Road Items such as Spikes and Pineapples are not considered Sub-Towers, but rather projectiles.
An important part of Sub-Towers is that they can inherit range-based tower buffs from their parent but cannot inherit Alch buffs or Overclock buffs. An exception is made for Etienne drones, which can be affected by Overclock buffs but not Alchemist buffs. Overclock can be targeted onto interactable sub-towers but will generally be wasteful due to the limited time duration of sub-towers.
In Bloons Adventure Time TD, sub-towers make appearance, but are mostly spawned from Warrior Bubblegum (Candy Archers, Gumball Guards, Candy Copters, and Gumball Guardian), Commander Cassie (M.A.F., Sidewinder Strike), Marceline (Skeleton archers), and Ice King (Snow monsters). Select weapons and trinkets may allow characters to summon additional sub-towers. Select allies (Moe, Party God) may summon additional units.
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