Upgrades

 are purchasable items that are bought with money. They give the tower that they are bought for an improvement.

Bloons TD 6
Below are a list of upgrades in BTD6. Open a section to read more about each tower and their upgrades. Hover over the image to read the official description of the selected upgrade. Click on the hyperlink of the selected upgrade name to read more information of that particular upgrade.

Note: Upgrades prices are valid as of Version 27.0. All descriptions are valid as of Version 27.0. Prices are shown in Medium Difficulty.

Dart Monkey
"Shoots a single dart that pops a single Bloon. A good, cheap tower suitable for the early rounds."

Upgrades:

Path 1

 * Long Range Darts: Makes the Dart Monkey shoot farther than normal.
 * Enhanced Eyesight: Increase attack range even further and allow Dart Monkey to shoot Camo Bloons.
 * Spike-O-Pult: Converts the Dart Monkey into a Spike-o-Pult, a powerful tower that hurls a large spiked ball instead of darts. Good range, but slower attack speed. Each ball can pop 18 Bloons.
 * Juggernaut: Hurls a giant unstoppable killer spiked ball that can pop lead Bloons and excels at crushing Ceramic Bloons.

Path 2

 * Sharp Shots: Can pop 1 extra Bloon per shot.
 * Razor Sharp Shots: Can pop 2 extra Bloons per shot.
 * Triple Darts: Throws 3 darts at a time instead of 1.
 * Super Monkey Fan Club: Super Monkey Fan Club Ability: Converts up to 10 nearby Dart Monkeys into Super Monkeys for 15 seconds.

Tack Shooter
"Shoots 8 tacks spread in all directions, each tack can pop 1 Bloon. Has short range and medium-slow fire rate."

Upgrades:

Path 1

 * Faster Shooting: Shoots tacks faster.
 * Even Faster Shooting: Shoots tacks even faster!
 * Tack Sprayer: Sprays out 16 tacks per volley instead of the usual 8.
 * Ring of Fire: Upgrade to a fast firing burst tower that shoots a deadly ring of flame instead of tacks.

Path 2

 * Extra Range Tacks: Tacks fly out further than normal.
 * Super Range Tacks: Tacks go much further than normal!
 * Blade Shooter: Converts tower into a Blade Shooter that shoots out razor sharp blades that are harder for Bloons to avoid.
 * Blade Maelstrom: Blade Maelstrom Ability: Covers the area in an unstoppable storm of blades.

Sniper Monkey
"Armed with a high-tech long range rifle, pops 2 layers off of Bloons with unlimited range." Upgrades:

Path 1

 * Full Metal Jacket: Shots can pop through 4 layers of Bloon - and can pop Lead and Frozen Bloons.
 * Point Five Oh: Shots can pop through 7 layers of Bloon!
 * Deadly Precision: Extreme accuracy and muzzle velocity cause up to 18 layers of bloon to be popped per shot - enough to destroy an entire Ceramic Bloon!
 * Cripple MOAB: Bullets from this tower temporarily take out propulsion systems of MOAB-class Bloons, immobilizing them for a short time.

Path 2

 * Faster Firing: Allows Sniper to shoot faster.
 * Night Vision Goggles: Allows Sniper to detect and shoot Camo Bloons.
 * Semi Automatic Rifle: Allows Sniper to take multiple shots and attack 3x as fast.
 * Supply Drop: Supply Drop Ability: Drops a crate full of Cash.

Bloons TD 4
(note: this section is unfinished)

Dart Monkey
Upgrades:
 * Piercing Darts: Cost: $140 Darts can pop two Bloons instead of one.
 * Long Range Darts Cost: $90 Gives the monkey more throwing distance.
 * Spike-O-Pult Cost: $300 Gives the monkey a catapult that hurls giant spiked balls.
 * Triple Shot Cost: $1,000 Spike-O-Pult becomes three times as deadly.

Tack Shooter
Upgrades:
 * Faster Shooting Cost: $210 Increases the fire rate of the Tack Shooter.
 * Extra Range Cost: $100 Increases the attack radius of the Tack Shooter.
 * Blade Shooter Cost: $280 Shoots razor sharp bladed discs instead of tacks!
 * Ring of Fire Cost: $2,500 Throws out a fiery hot burst of flame that can pop anything.

Boomerang Thrower
Upgrades:
 * Multi Target Cost: $250 Boomerang will hit up to seven Bloons at once.
 * Sonic Boom Cost: $100 Sonic boomerangs smash through frozen Bloons.
 * Glaive Thrower Cost: $280 Glaives slice through up to twelve Bloons at once!
 * Lightsabre Thrower Cost: $1,850 Lightsabre slices through anything and everything up to seventy Bloons at once!

Mortar Tower
Upgrades:


 * Greater accuracy: Increases accuracy of mortars.
 * Rapid reload: Increases fire rate.
 * Bloon buster: Smashes through 2 layers of bloons.
 * Mortar battery: Shoots 3x faster.

Glue Gunner
Upgrades:
 * Stickier glue: Glue lasts longer
 * Glue soak: Glue goes through all the layers of bloons.
 * Corrosive glue: Pops bloons every 2 seconds.
 * Glue splatter: Glue splashes affecting up to 20 bloons.

Monkey Ace
Upgrades:
 * Pineapple express: Sometimes drops explosive pineapples on the map.
 * Spy plane: Allows detection of camo bloons near the plane.
 * Rapid fire: Shoots faster.
 * Operation: Dart storm: Shoots twice as many darts.

Monkey Buccaneer
Upgrades:
 * Grape shot: Adds a small volley of grapes to the shot.
 * Crow's nest: Allows detection of camo bloon within its radius.
 * Longer cannons: Increases range.
 * Battle ship: Shoots 3x faster.

Monkey Apprentice
Upgrades:
 * Intense magic: Pops 7 bloons instead of 2.
 * Fireball: Throws a fireball that explodes on impact.
 * Summon whirlwind: Causes a whirlwind that sends bloons back the map but thaws out and removes glue.
 * Tempest tornado: Massive whirlwind that sends back bloons and pops up to 120.

Super Monkey
Upgrades:
 * Super range: Greatly increase range.
 * Laser vision: Can pop 2 bloons at once and frozen bloons.
 * Plasma vision: Shoots twice as fast and destroys anything it touches.
 * Sun god: Shoots 3 golden beams in a spread pattern obliterating everything.

Banana Farm
Upgrades:
 * More bananas: Gives 120 money per round.
 * Banana plantation: Gives 250 money per round.
 * Banana republic: Gives 500 money per round.
 * Banana research facility: Gives 2000 money per round.

Dartling Gun
Upgrades:
 * Steady Firing: Lowers the firing spread.
 * Powerful Shots: Makes darts fly out with greater speed, and makes them pop 3 bloons at once.
 * Increased Barrel Spin: Increases the gun's fire rate.
 * Laser Cannon: Converts to a cannon that shoots super powerful beams able to cause massive bloon damage.

Spike Factory
Upgrades:
 * Bigger Stacks: More stacks = win
 * White Hot Spikes: Now, tacks could pop lead bloons
 * Faster Production: Produces tacks faster
 * Spike Storm: Every 20 seconds, the factory generates a storm of short-lived tacks filling up the entire track.

Dart Monkey
Upgrades:
 * Long Range Darts: Increases the range of your Dart Monkey. Costs $75 on Easy, $90 on Medium and $95 on Hard.
 * Extra Long Range Darts: Gives the monkey even more throwing distance. Costs $75 on Easy, $90 on Medium and $95 on Hard.
 * Piercing Darts: Pops 3 bloons instead of 2. Costs $120 on Easy, $145 on Medium and $150 on Hard.
 * Razor Darts: Pops 3 bloons instead of 2. Costs $100 on Easy, $120 on Medium and $130 on Hard.

Tack Shooter
Upgrades:
 * Faster Shooting: Makes tack shoot faster. Costs $170 on Easy, $205 on Medium and $215 on Hard.
 * Blade Shooter: Shoots blades instead of tacks! Costs $155 on Easy, $185 on Medium and $195 on Hard.
 * Extra Range: Covers a larger area than normal. Costs $85 on Easy, $100 on Medium and $110 on Hard.
 * Super Range: Covers a huge area! Costs $85 on Easy, $100 on Medium and $110 on Hard.

Boomerang Thrower
Upgrades:
 * Multi Target: Boomerang will hit up to 5 bloons at once. Costs $230 on Easy, $275 on Medium and $290 on Hard.
 * Glaive Thrower: Glaives slice through up to 8 bloons at once! Costs $240 on Easy, $285 on Medium and $300 on Hard.
 * Sonic Boom: Sonic boomerangs smash through frozen bloons. Costs $130 on Easy, $155 on Medium and $160 on Hard.
 * Thermite: Thermite can melt through lead bloons. Costs $100 on Easy, $120 on Medium and $130 on Hard.

Spike-o-pult
Upgrades:
 * Longer Range: Increases maximum range of Spike-o-pult. Costs $215 on Easy, $250 on Medium and $270 on Hard.
 * Juggernaut: Spike-o-pult balls roll much further. Costs $700 on Easy, $840 on Medium and $890 on Hard.
 * Faster Reload: Can shoot faster than normal. Costs $215 on Easy, $255 on Medium and $270 on Hard.
 * Multi Shot: Shoots three spikey balls at once! Costs $490 on Easy, $585 on Medium and $620 on Hard.

Cannon
Upgrades:
 * Bigger Bombs: Big bombs affect a larger area. $365 on Easy, $440 on Medium and $465 on Hard.
 * Frag Bombs: Fragments fly out and pop even more bloons! $185 on Easy, $225 on Medium and $240 on Hard.
 * Extra Range Bombs: Can shoot bombs further than normal. $170 on Easy, $205 on Medium and $215 on Hard.
 * Missile Launcher: Missiles fly super fast. Costs $180 on Easy, $215 on Medium and $225 on Hard.

Ice Ball
Upgrades:
 * Longer Freeze: Bloons stay frozen for longer. Costs $215 on Easy, $255 on Medium and $270 on Hard.
 * Permafrost: Slows down bloons even after they thaw out! Costs $215 on Easy, $255 on Medium and $270 on Hard.
 * Wide Freeze Radius: Pops 1 layer of bloons and then freezes. Costs $170 on Easy, $205 on Medium and $215 on Hard.
 * Snap Freeze: Freezes so violently that some bloons will pop before freezing! Costs $245 on Easy, $295 on Medium and $315 on Hard.

Monkey Beacon
Upgrades:
 * Stronger Signal: Gives monkey beacon a wider area of effect. Costs $425 on Easy, $510 on Medium and $540 on Hard.
 * Jungle Drums: Gives a boost to attack rate to towers within its range. Costs $1275 on Easy, $1530 on Medium and $1620 on Hard.
 * Monkey Storm Beacon: Can call Super Monkey Storms! Costs $2125 on Easy, $2550 on Medium and $1700 on Hard.

Super Monkey
Upgrades:
 * Laser Vision: Laser can pop 2 bloons at once, and pop frozen bloons. Costs $2975 on Easy, $3570 on Medium and $3780 on Hard.
 * Plasma Vision: Plasma vaporizes everything it touches! Costs $3400 on Easy, $4080 on Medium and $4320 on Hard.
 * Super Range: Super Range can cover nearly half the screen. Costs $850 on Easy, $1020 on Medium and $1080 on Hard.
 * Epic Range: Epic range allows almost whole map coverage! Costs $1190 on Easy, $1430 on Medium and $1510 on Hard.

Trivia

 * According to Jake the Dog in Bloons Adventure Time TD, upgrading gives a tickling sensation.
 * In BTD6, a purchased upgrade is referred as "Owned".