Bloons Wiki
Bloons Wiki
Added twin gun doubles attack speed.
~ Description from Bloons TD 5

Twin Guns is the first upgrade on the second path for the Monkey Sub in BTD5. It adds a second gun to the sub, which enables it to fire twice as fast. This can be useful when used in combination with Barbed Darts because the sub now essentially has 6x the popping power of an unupgraded Monkey Sub (1 pierce).

It costs $380 on Easy, $450 on Medium, $485 on Hard, and $540 on Impoppable.


  • This upgrade is usually used as a stepping stone to the next upgrade, Airburst Darts.
  • This upgrade is useful for early-game due to its relatively fast attack speed.



  • The old description for Twin Guns in BTD6 used to be the same as in BTD5, but was since changed in Version 18.0 due to a buff to the interactions with Bloontonium Reactor and Ballistic Missile for BTD6.