Hotkeys

 are keys on the keyboard that perform certain actions in BTD4, BTD5, Bloons TD Battles, Bloons TD Battles 2, Bloons Monkey City, BTD6, and Bloons Adventure Time TD. Pressing them will instantly place the chosen tower on your mouse ready for placement or it will perform another action listed below. Sometimes the player has to click on a Hotkey twice for it to register with the game (this used to happen in BTD5, hotkeys can now only be pressed once, but this still applies to BTD5 Deluxe, even in the latest version). Hotkeys allow you to shortcut controls while you are playing the game. The keys in Bloons Monkey City are the same as the ones in Bloons TD 5.

Bloons TD 4 Hotkeys
Bloons TD 4 is the first of the Bloons TD series to support hotkeys. Strangely, despite introduction of the Dartling Gun and Spike Factory in later updates, there are no hotkeys for either of them.

Bloons TD 5 Flash & Bloons Monkey City Flash Hotkeys
Hotkeys for Bloons TD 5 Flash and Bloons Monkey City are identical, although some towers are exclusive to one another.

Sandbox Mode Hotkeys (BTD5)
These are keys used to spawn bloons in BTD5. The spawn keys are listed below:

Bloons TD 5 Deluxe Hotkeys
Equivalent to that for BTD5 Flash and BMC Flash, except with more support for new towers introduced in the game.

Bloons TD 5 Steam Hotkeys
Exactly the same as BTD5 Flash or BMC Flash except with more support for new towers introduced in the game.

Bloons TD 5 Mobile & Bloons Monkey City Mobile
Hotkeys are not supported in Bloons TD 5 Mobile & Bloons Monkey City Mobile. The BMCm Steam version's hotkeys are identical to TD5 Steam, however tower hotkeys may only be used while controls are set to Click & Drop.

Bloons TD Battles Steam
In Bloons TD Battles Steam, hotkeys are supported for placing towers and activating Powers. Unlike the Flash version, support for bloon send hotkeys are absent.

BTD6 Steam Hotkeys
The following are the default keys for when playing on BTD6 Steam. This will also work on BTD6 Mobile if using an external keyboard.

Bloons Adventure Time TD Hotkeys
Bloons Adventure Time TD supports hotkeys on Steam (also on Mobile if using an external keyboard?) and uses them for various functions of the game. Strangely, keys for selecting towers in the Characters menu and for activating abilities are absent.

Bloons TD Battles 2
Only appears to be available for Bloons TD Battles 2 Steam. An external keyboard option currently appears to be unavailable in the mobile version.