Tower Skins are customisable visual changes on towers that can be bought in Bloons TD Battles and Bloons TD 5 Mobile. These cost real money, costing $3.99 USD ($1.99 USD on BTD5) to buy each. When purchasing at least one of the tower skins in BTDB Mobile, the player will receive 500 along with the removal of forced advertisements; in BTD5 Mobile, there is no secondary reward. Tower Skins do nothing to the tower except change its visual appearance; however, they may sometimes be useful in some cases. Each skin requires their original form.
The Dart Monkey and its upgrades don full medieval armor. Visual change only.
~ Dart Monkey "Medieval" Skin description
Dart Monkeys now wear medieval clothing. The 0-0 shows the monkey with a small cape and armwear. The first tier upgrades gives the monkey a knight helmet with green plume and the second tier upgrades change the plume color to red. The Spike-o-pult's helmet and catapult have changed; the catapult is more metal-like and the monkey's helmet keeps the red prune. The Juggernaut changed the catapult's metal surroundings to a golden material. Triple Darts changes the monkey's helmet to a green leather helmet with a red feather, and has a backapck with darts similar to the unskinned monkey. Super Monkey Fan Club wears a yellow and red cloak, and the Super Monkeys from the ability appear like gladiators.
The Dart Monkey and its upgrades are feeling festive! Visual change only.
~ Dart Monkey "Christmas" Skin description
Dart Monkeys now are themed for Christmas. 0/0 Dart Monkey is a reindeer, Tier-1 Dart Monkeys have a green elf hat with a red hat fringe, and Tier-2 Dart Monkeys have a red elf hat with a green hat fringe. Spike-o-Pult and Juggernaut upgrades are now Santas with a Christmas pudding on a catapult with a Christmas sled design. Triple Darts is now a snowman with a small hat, while a Super Monkey Fan Club Leader is now a snowman with a black top hat. When Super Monkey Fan Club is activated, the Super Monkeys are now Super Monkeys with Santa hats. This skin also seems to affect the Juggerlanche Power card in Card Battles by replacing the falling Juggernaut balls with pudding.
First released on 6th December 2017. Any user who logged in between 6th December 2017 and 16th December 2017 automatically gets a free Christmas Dart Monkey Skin. It has been extended from 16th December 2017 to 19th January 2018.
The Dart Monkey and its upgrades just got a lot scarier! Visual Change only.
~ -Dart Monkey "Halloween" Skin description
Dart Monkeys now are Halloween themed. 0-0 is a zombie monkey. The first tier degrades the monkey, having part of its head removed, showing its brain and its right eye pulled out of the eye socket. Tier 2 Dart Monkeys are now wrapped like mummies. Spike-o-pult and Juggernaut upgrades are now "Frankenmonkeys" controlling a catapult made of bones. Spike-o-pult launches skulls and Juggernaut launches a giant pumpkin. Triple Darts are now wearing a black costume and show skeleton parts on the suit design. Super Monkey Fan Club monkeys are now costumed as a grim reaper holding a scythe in their left arm. When the ability is active, Dart Monkeys become ghosts.
The skin was released on 24th October 2018 to BTD5 Mobile in the 3.17 update and was put in the shop for a limited time. Anybody who purchased the skin will keep it forever until next Halloween.
Lift the lid on the tack tower and see the wheels turn. Visual change only.
~ Tack Tower Skin description
Called the "Tack Tower" in the description, the Tack Shooter now shows its mechanical gears and wind-up keys, as if the monkeys have opened up the case of the Tack Shooter. Upgrading the Tack Shooter will remove the wind-up key and adds more gears inside the tower which differ as you upgrade them more. The Tack Sprayer and Blade Shooter upgrades have pumps instead of gears. The Ring of Fire and Blade Maelstrom are colored from pink to orange as well, the Ring of Fire now having tubes going in and out of each end with some flash of fire traveling inside the tubes, and Blade Maelstrom has a bigger gear spinning on rubber bands.
The Sniper and its upgrades are hunting big game bloons! Visual change only.
~ Sniper Monkey Skin description
Sniper Monkeys now wear a hunter hat instead of a military cap, but keeps the same color theme at low level upgrades, but the Night Vision Goggles gives the Sniper a hi-tech visor instead of binoculars. The Deadly Precision upgrade gives it a cowboy hat with the right side bent and some orange glasses. Cripple MOAB removes the glasses but gives the monkey a safari hunter style hat. Semi Automatic Rifle gives the tower a forest hunter styled hat, and Supply Drop gives it an Australian hunter hat. The Supply Drop ability plane is based depending on whether you have the Ace skins active or not and the box of cash depends on whether you have the Farm skins applied or not.
The Boomerang Thrower and its upgrades are going native! Visual change only.
~ Boomerang Thrower Skin description
Boomerang Throwers now have a tribal appearance, and each upgrade changes the asethetics and headwear of the monkey. The Glaive Thrower upgrade however gains a tribal mask. Glaive Ricochet changes the mask appearance and hairstyle, and Glaive Lord gains an aztec-like mask. Bionic Boomer gaind a feather headpiece and has a slingshot where it can therow boomerangs/glaives from. Turbo Charge changes the headpiece into a barbarian-like helmet, making this tower skin distinguish the difference between the x-3 and x-4 upgrades, where the unskinned variant doesn't change anything aesthetical to Turbo Charge.
The Buccaneer and its upgrades join the Navy! Visual change only.
~ Monkey Buccaneer Skin description
The Monkey Buccaneer and its upgrades are naval-themed.
The 0/0 Buccaneer initially appears as a black naval dinghy with grey cannons, controlled by a single naval sailor. Purchasing Faster Firing (for 1/0 and 1/1) will add flying red flags to the boat. Purchasing Longer Cannons without Crow's Nest will hide the naval sailor and upgrade the boat to an enclosed iron boat. Adding Crow's Nest will give the Longer Cannons appearance automatically, but now it also causes the boat's radar to spin.
The Buccaneer appears much different along other paths.
The Destroyer becomes a much fiercer destroyer, now with a four-barreled bun and a fully enclosed ship. There is also a significant difference with the Aircraft Carrier, with a new darker grey ship, along with mini Apache Dartships instead of mini Monkey Aces as the aircraft.
The Cannon Ship becomes a large blue ship operated by four smaller naval sailors that operate four of the six cannons on the ship. The ship's radar continues to spin, like the Crow's Nest. The Monkey Pirates is now a much larger blue naval ship. The hook remains the same though.
The Banana Farm and its upgrades get a massive calorie increase. Visual change only.
~ Banana Farm Skin description
Banana Farms now give sweets instead of bananas, and the upgrade patterns resemble those of the classic Farm's. The tree trunks are candy canes, the leaves are cotton candy and they have candy on them. More Bananas increases the size of the tree, Banana Plantation now has 4 smaller candy trees, Banana Republic is now a gingerbread house. Banana Reserach Facility has been recolored to be candy themed, the icon is changed to a big candy instead of a banana, the roof is made of chocolate and it gives boxes of candy instead of boxes of bananas. Monkey Bank's appearance is a candy shop, and Banana Investments Advisory turns into a chocolate castle.
The Mortar and its upgrades light up the sky with fireworks. Visual change only.
~ Mortar Tower Skin description
The Mortar Tower becomes a fireworks launcher. The monkey itself wears a hard helmet instead of a military one, and the fireworks themselves change in color and appearance with every upgrade. The Big One maked the firework bigger and the monkey wears eye protection. Artillery Battery has three fireworks launching all at once and the monkey wears some headphones
The Monkey Engineer is experimenting with some mad science! Visual change only.
~ Monkey Engineer Skin description
The Monkey Engineer has turned into a scientist wearing a lab coat and nerdy goggles and has hair and a mustache. His nail gun is the only thing that changes colors when upgraded in the same scheme to the classic Engineer's helmets. Cleansing Foam's dispenser has some purple liquid on the dispenser which also turns the foam color from white to pruple. Bloon Trap is also shaped more round than sharp, resembling more of a smaller Spike Factory in shape, but it still collects bloons the same. Larger Service Area and Overclock add a weapon extender at the gun and also look the same in design, while Sprockets removes the extender, probably unintentional. The Sentry guns also change in appearance when the skins are active.
The Heli-Pilot and its upgrades prepare for close encounters. Visual change only.
~ Monkey Engineer Skin description
The Heli-Pilot becomes a U.F.O., and each upgrade adds more aesthetics to the tower. Quad Darts gives secondary dart shooters and a pair of jets on its rear; Bigger Jets only adds the pair of jets, missing the secondary guns. Both upgrades also add flickering lights going clockwise. Pursuit and Enhanced IFR Instruments change the U.F.O.'s color to gray, like the normal Heli Pilot. Razor Rotors turns the lights from the U.F.O. to red and adds five sharp blades going counter-clockwise. Downdraft only chagnes the lights to blue. Apache Dartship changes the color to black and adds the machine gun support in front. Support Chinook makes the U.F.O. bigger in size and can add the dart shooters and jets if you upgrade it to Quad Darts.
First released with the Area 52 map, in July 17th 2017.
Some skins, such as the Tack Shooter Skin, now have extra animations added to them.
The Dart Monkey was the first tower to get a skin, and also the first (and only) tower to get more than one skin.
So far, the Spike Factory, Ice Tower, Glue Gunner, Monkey Village, Bloonchipper and COBRA are the only towers that didn't get a skin.
In BTD5 Mobile, discounts to Tower Skins drop the prices from $1.99 USD to $0.99 USD. In BTDB Mobile, discounts to Tower Skins usually drop from $3.99 USD to $2.99 USD.
The Sniper Monkeys "Deadly Precision" skin is likely a reference to the Sniper from the game, Team Fortress 2. The Sniper from Team Fortress 2 wears a similar hat and glasses combo to the Sniper Monkey, and both characters are Snipers in their respective games.