Added twin gun doubles attack speed.
~ Description from Bloons TD 5 and Bloons TD 6

The Monkey Sub with twin guns.


BTD6 official artwork

Twin Guns is the first upgrade on the second path for the Monkey Sub in BTD5 and the third path in BTD6. 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.


Easy: $380, Medium: $450, Hard: $485, Impoppable: $540


  • This upgrade is usually used as a stepping stone to the next upgrade, Airburst Darts.


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