Hotkey
Hotkeys are keys on the keyboard that perform certain actions such as selecting some Tower or activating Abilities. Hotkeys exist in desktop versions of Bloons TD 4, Bloons TD 5, Bloons TD Battles, Bloons Monkey City, Bloons TD 6, Bloons Adventure Time TD, and Bloons TD Battles 2.
Bloons TD 4
Bloons TD 5
Bloons Monkey City
Bloons TD Battles
Bloons TD 6
Mermonkey and Desperado do not have set hotkeys and have to be manually set by the player.
Advanced Hotkeys
Introduced in v42.0, advanced hotkeys can do certain special actions. These hotkeys are unassigned by default.