Tower Cost Specialties

BTD4

BTD5

“	... Finally, we have included Tower Specialties, which you will unlock after completing the new tracks in various difficulty levels. The specialties allow you to customize your strategy by making some towers much cheaper to buy, at the expense of increasing the cost of all others.	”
	~ Bloons Tower Defense 4 Expansion description on ninjakiwi.com

Tower Specialties, usually shortened to specialties, are a game mechanic in Bloons TD 4 Expansion. They are options the player can choose from at the beginning of each game to modify the costs of towers, upgrades, and road items. Only one specialty can be selected per game.

By default, the only specialty available is None, which has no modifiers. Additional specialties can be unlocked by completing tracks at or above certain difficulties. Each of these specialties reduces the base cost and upgrade costs of two or three towers or road items by 20%, while raising the base cost and upgrade costs of all other towers and road items by 10%.

Specialties do not exist in Bloons TD 4 or the Mobile version.

List of specialties

Name	Description	Unlock condition	Notes
None	All towers and upgrades cost the normal amount.	N/A	Unlocked by default.
Classic	Dart Monkeys, Boomerang Throwers, Tack Towers and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 1, The Beach, on Easy or harder to unlock Classic specialty.
Support	Monkey Beacons, Banana Farms, and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 2, Sewer, on Medium or harder to unlock Support specialty.
Munitions	Bomb Towers, Mortars, Pineapples and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 3, Monkey Temple, on Medium or harder to unlock Munitions specialty.
Vehicles	Monkey Aces, Buccaneers, and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 1, The Beach, on Hard to unlock Vehicles specialty.	While this specialty does reduce the base cost of the Monkey Ace and Monkey Buccaneer by 20% correctly, their upgrades behave as if their cost has been increased by 10%. The correct amount is deducted when they are purchased, however.
Slow Down	Ice Towers, Glue gunners, Monkey Glue and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 2, Sewer, on Hard to unlock Slow Down specialty.
Supernatural	Super Monkeys, Monkey Apprentices and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 4, Triangle, on Medium or harder to unlock Supernatural specialty.
New Towers	The new towers, Dartling Gun and Spike Factory and their upgrades cost 20% less. everything else costs 10% more.	Pass Track 3, Monkey Temple, on Hard to unlock New Tower specialty.	Introduced in Version TBA.

Quotes

“	... and another new feature called “Specialist”. This little brainwave allows you to specialise in a certain tower type, for example “Classic” allows you to specialise in Dart Monkeys, Tack Towers and Boomerang Throwers. When you do this the cost of those towers and upgrades is reduced by 20% and all other towers and upgrades is increased by 10%. This adds a really neat level of flexibility to your gameplay and allows you to pick a style to suit the track and to really stretch out into different strategies.	”
	~ Bloons TD4 Expansion publicity blurb

Trivia

• The bug with the Vehicles specialty is due to a repeated typo in the game's code: when determining if a discount should be applied, the game checks if the ID of the specialty the player is currently using is the same as the ID that is assigned to the tower, upgrade or road item, but all the upgrades for the Monkey Ace and Monkey Buccaneer are assigned the ID "vehcicles", when the correct ID is "vehicles". This affects the displayed cost and whether or not the game considers the upgrade to be purchasable with the player's current amount of cash, but does not affect the actual amount of cash that gets deducted when the upgrade is purchased.
• Some of the specialties are similar to the classifications introduced in Bloons TD 6:
  • Classic is similar to the Primary class, barring the inclusion of a road item.
  • Support is similar to the Support class, with the Monkey Beacon being a precursor to the Monkey Village.
  • Vehicles is similar to the Military class.
  • Supernatural is similar to the Magic class.