Mermonkey (BTD6)

Mermonkey iterations: BTD6

Mermonkey

A magical trident throwing Monkey of the sea that calls upon the power of the depths for damage, support, or Bloon clean up. Amphibious, but thrives in water.

Unlock method(s)	Gift Box (3,000,000 pops) Shop (Mermonkey Unlock Pack)
Category	Magic
Cost	$255 — Easy $300 — Medium $325 — Hard $360 — Impoppable
Introduced	Version 44.0

The Mermonkey is a Magic tower in Bloons TD 6, introduced in version 44.0. It attacks by throwing tridents that create damaging splashes around each Bloon they hit, similar to Hydra Rocket Pods and Captain Churchill's explosives. Each trident can create two splashes by default. Each trident has a very brief (0.05s) cooldown between activating a splash on a new target. The Mermonkey can be placed on both land and water, but has 35% more range if placed in water.

It can be upgraded to awaken an abyssal creature, fire freezing water attacks, or sing magical songs which heavily impede the bloons.

Upgrades

Path 1

Trident Efficiency

Tier 1 — 160 XP to unlock

Acclimation to local water density allows Mermonkey to attack faster with all attacks.

$130 — Easy
$150 — Medium
$160 — Hard
$180 — Impoppable

This upgrade reduces the attack cooldown of the Mermonkey's trident attack by 20%, effectively increasing its attack speed by 25%. Crosspathing with Alluring Melody and above reduces the delay of the trance attack pulling in Bloons by 10% (effectively +11.11% pull rate), but does not affect its attack cooldown.

Trident Swiftness

Tier 2 — 580 XP to unlock

Tridents are thrown faster and travel further.

$210 — Easy
$250 — Medium
$270 — Hard
$300 — Impoppable

This upgrade reduces the cooldown of the trident attack by a further 25% (effectively +33.33% attack speed), for a total of 40% reduced cooldown (effectively +66.67% attack speed) relative to the base tower, due to it stacking on top of Trident Efficiency. It also increases the projectile speed of its tridents by 50%, but reduces their lifespan, so the maximum distance they can travel before expiring is effectively the same. Contrary to its description, this upgrade affects other attacks when crosspathed, not just the trident attack:

• With Alluring Melody and above, it reduces the delay of the trance attack pulling in Bloons while active by 10%, for a total of -21% in combination with Trident Efficiency (effectively +23.46% pull rate overall).
• With Riptide Champion and above, it increases the rate that its projectiles gain size and damage at by 50%, to compensate for their reduced lifespan. For Popseidon, it only affects the side tridents in this way.
• With Arctic Knight and above, it also increases the projectile speed of Ice Jet's ice balls by 50%, without reducing their lifespan.

Abyss Dweller

Tier 3 — 2,800 XP to unlock

The Abyssal Creature awakens, angrily lashing out at Bloons with powerful tentacles and granting nearby Monkeys a small pierce increase.

$1,530 — Easy
$1,800 — Medium
$1,945 — Hard
$2,160 — Impoppable

This upgrade grants the Mermonkey an Abyssal Creature that slaps nearby Bloons with its eight tentacles, dealing 8 Shatter-type damage with 15 pierce. Each tentacle is a separate attack with a 3-second attack cooldown, angled 45° apart from each other in a circle. Each tentacle can only target Bloons within a 45° cone in front of it, in addition to sharing the same range limit as the Mermonkey. Additionally, this upgrade increases the damage of the Mermonkey's trident splashes from 2 to 4, and it now grants a +10% pierce buff to all towers in its range (excluding itself and Paragons).

Abyssal Warrior

Tier 4 — 11,000 XP to unlock

Coats tridents in a thick ink that slows bloons. Abyssal creature grows in power, destroying most Bloons with ease and enhancing nearby Monkeys with more pierce.

$3,570 — Easy
$4,200 — Medium
$4,535 — Hard
$5,040 — Impoppable

This upgrade allows the Mermonkey's trident splashes to coat Bloons they hit in ink, slowing all their layers for up to 10 seconds. It slows regular Bloons by 40% and MOABs and BFBs by 28%, but does not affect any other MOAB-Class Bloons, and does not affect Bloons that the splashes cannot deal damage to. This upgrade also imrpoves other aspects of the Mermonkey:

• The Abyssal Creature's tentacles now deal 12 damage and +6 damage to Ceramic Bloons (enough to one-shot a non-Fortified non-Super Ceramic), have 25 pierce instead of 15 (still gaining +35% pierce with the Sharper Prongs crosspath), the slaps cover a 50% larger area, and their attack cooldown reduces from 3 seconds to 2.5 seconds (effectively increasing their attack speed by 20%).
• The Mermonkey's trident splashes now deal 8 damage instead of 4.
• The Mermonkey's buff to towers in range now increases their pierce by 20% instead of 10%.

Lord of the Abyss

Tier 5 — 68,000 XP to unlock

The fully unleashed wrath of the Abyssal Creature brings the power of the depths to the surface, annihilating most Bloons, and greatly enhancing the pierce of nearby Monkeys.

$19,550 — Easy
$23,000 — Medium
$24,840 — Hard
$27,600 — Impoppable

This upgrade increases the Mermonkey's range from 28 units to 32 units and allows water-based towers to be placed on land within its 32-unit range (functioning like the opposite of Arctic Wind). This upgrade also improves other aspects of the Mermonkey:

• The Abyssal Creature's tentacles now deal 32 damage (while still dealing +6 damage to Ceramic Bloons), have 50 pierce instead of 25 (still gaining +35% pierce with the Sharper Prongs crosspath), the slaps cover twice as large an area, and their attack cooldown reduces from 2.5 seconds to 1.5 seconds (effectively increasing their attack speed by ~66.7%).
• The Mermonkey's tridents attack twice as fast and have 9 pierce instead of 2. Their splashes now deal 10 damage instead of 8, but retains the same pierce as its predecessors.
• The Mermonkey's buff to towers in range now increases their pierce by 40% instead of 20%.

Path 2

Sharper Prongs

Tier 1 — 150 XP to unlock

Can pop more Bloons with each attack.

$170 — Easy
$200 — Medium
$215 — Hard
$240 — Impoppable

This upgrade increases the pierce of its tridents by 1 (from 2 to 3 with its base stats) and splashes by 3 (from 3 to 6 with its base stats).

Crosspathing with Abyss Dweller grants its tentacle attacks +35% pierce. Crosspathing with Alluring Melody grants its trance attack +2 pierce.

Tidal Chill

Tier 2 — 700 XP to unlock

Icy tridents are larger and can freeze Bloons.

$190 — Easy
$225 — Medium
$245 — Hard
$270 — Impoppable

This upgrade increases the radius of the trident splashes by 50% and causes the splashes to freeze Bloons they hit. The freeze lasts for 4 Bloon layers or 0.5 seconds, only applies to Bloons the splashes can deal damage to, and does not apply to MOAB-Class Bloons at all.

Riptide Champion

Tier 3 — 2,500 XP to unlock

Mermonkey draws energy from the sea. Tridents can pop Lead Bloons, grow in power as they travel, and crash with devastating force.

$1,700 — Easy
$2,000 — Medium
$2,160 — Hard
$2,400 — Impoppable

This upgrade replaces its original trident attack with a new trident attack that fires every 1.5 seconds instead of every 1.2 seconds (20% slower than before) and has 32 units of range instead of 28 units. Its tridents move slower and don't create splashes, but they now grow in size and damage as they travel, and they spawn two wavelet projectiles laterally at the end of their lifespans or upon colliding with a wall (they do not spawn by running out of pierce).

At base, both the tridents and the wavelets have 25 pierce, deal 4 Frigid-type damage and +2 damage to frozen Bloons, and freeze all layers of Bloons they deal damage to for up to 1 second (0.5 seconds for Ceramic Bloons). They pass through White Bloons and Zebra Bloons (but not Purple Bloons) instead of colliding with them unless buffed to be able to deal damage to them. Per second of travel time, the tridents gain 50% more damage (capped at 3× damage, though this is functionally impossible to reach without projectile lifespan buffs) and 10% more radius, while the wavelets lose 20% radius (but do not lose damage).

Arctic Knight

Tier 4 — 16,000 XP to unlock

Tridents grow in power faster. Ice Jet ability: Launches a barrage of bouncing ice balls following target priority, or targeted point.

$6,800 — Easy
$8,000 — Medium
$8,640 — Hard
$9,600 — Impoppable

This upgrade unlocks the Ice Jet Activated Ability, which causes the Mermonkey to stop using its trident attack, instead rapidly firing ice balls straight ahead with a small degree of random spread, for 3 seconds. The ice balls deal 20 Frigid-type damage that cannot soak through layers, with 240 pierce, freeze up to 3 layers of non-MOAB-Class Bloons for 3 seconds, and can bounce off walls. By default, the ability targets Bloons over infinite range according to the tower's current targeting option, but the player can also lock the attack in one direction like a Dartling Gunner by using its Monkey Special. The ability has a cooldown of 45 seconds.

This upgrade also improves the Mermonkey's trident attack, increasing base damage of the tridents and wavelets from 4 to 8, and dealing +4 damage to frozen Bloons and +8 damage to MOAB-Class Bloons. Each trident scales damage and projectile size by 75% per second (112.5% with the Trident Swiftness crosspath) instead of 50%, with a cap of 3×.

Popseidon

Tier 5 — 70,000 XP to unlock

Popseidon's Ice Jet ability draws such power that a rogue wave floods the map with supercooled water, freezing all Bloons and reclaiming the weak for the sea.

$44,200 — Easy
$52,000 — Medium
$56,160 — Hard
$62,400 — Impoppable

This upgrade enhances its Activated Ability, increasing the damage its ice balls deal from 20 to 30 and allowing them to bounce off the edges of the map. It also causes the ability to summon a flood that deals 70 Frigid-type damage to all Bloons on-screen (including Camo Bloons, even if it lacks Camo detection) and slows all Bloons (even Bloons it cannot deal damage to) to 50% speed for 8 seconds.

Additionally, this upgrade increases the Mermonkey's range from 32 units to 40 units, doubles the attack speed of the trident attack, increases the base damage of the tridents and wavelets from 8 to 15, increases the damage they deal to frozen Bloons to +7.5 and to MOAB-Class Bloons to +15, and increases the rate they gain damage to 112.5% per second. With this upgrade, it also fires two more tridents each time it attacks, angled 45° to each side of the middle trident.

Path 3

Echosense Precision

Tier 1 — 150 XP to unlock

Tridents can detect Camo bloons and tridents seek their target.

$170 — Easy
$200 — Medium
$215 — Hard
$240 — Impoppable

This upgrade grants all of the Mermonkey's attacks Camo detection and allows its tridents to home in on Bloons within 80 units from any direction.

Crosspathing with Trident Swiftness increases the tridents' rotation rate while seeking to compensate for their increased movement speed, while crosspathing with Riptide Champion reduces their rotation rate to counterbalance their reduced movement speed. With Arctic Knight, it also reduces the random spread angle of its Ice Jet ability from 30° to 10°, but with Popseidon, it no longer reduces the ability's spread, instead increasing the spread angle of its side tridents (not the wavelets) from 45° to 60°.

Echosense Network

Tier 2 — 670 XP to unlock

Increases range for all Echosense Mermonkeys. Stacks up to 10 times.

$240 — Easy
$280 — Medium
$300 — Hard
$335 — Impoppable

This upgrade applies a buff to all Mermonkeys with this upgrade (including itself), or a further upgrade on the same path, that increases their range by 7.5%. This buff stacks additively for each Mermonkey with this upgrade up to 10 times, for a maximum of +75% range for all affected Mermonkeys.

Alluring Melody

Tier 3 — 3,000 XP to unlock

Entrances non MOAB-Class Bloons with a hypnotic tune, magically detonating all damage over time effects, disrupting Bloon movement, and strips Camo.

$1,700 — Easy
$2,000 — Medium
$2,160 — Hard
$2,400 — Impoppable

This upgrade unlocks a new attack for the Mermonkey that pulls non-MOAB-Class Bloons into a trance. The attack creates an area of effect that causes Bloons that enter it to lose Camo properties, instantly take the total remaining damage of damage over time if they have any (capped at 50 damage each), and continuously circle around the tower anticlockwise. It lasts for 6 seconds, returning tranced Bloons to where they were before when it ends, and has a 12-second cooldown (effectively 50% uptime without buffs). It has 6 pierce (with Ceramic Bloons consuming 2 pierce), which determines how many Bloons it can entrance at a time. This upgrade also increases the pierce of the Mermonkey's trident splashes from 3 to 9.

Symphonic Resonance

Tier 4 — 14,500 XP to unlock

Hypnotic tune can affect low tier MOAB-Class Bloons. Can be set to echo from a nearby point.

$6,460 — Easy
$7,600 — Medium
$8,210 — Hard
$9,120 — Impoppable

This upgrade increases the Mermonkey's range from 28 units to 32 units and enhances the trance attack. It now has 12 pierce instead of 6 (still gaining +2 pierce from the Sharper Prongs crosspath), no longer consumes +1 pierce from Ceramic Bloons, can deal up to 125 damage from detonating damage over time instead of 50, and can now pull MOABs and DDTs into its trance (with MOABs consuming +2 pierce and DDTs consuming +3). Tranced MOAB-Class Bloons orbit at one-third the speed of regular Bloons.

This upgrade also unlocks a Monkey Special that allows the player to place a totem sub-tower anywhere within the Mermonkey's range, which causes the trance to emit from the totem instead of the Mermonkey. The player can also use the Monkey Special to remove the totem and return the trance attack to the Mermonkey, with a 6-second cooldown before the player can place the totem again.

The Final Harmonic

Tier 5 — 52,000 XP to unlock

This elder can echo its irresistible tune anywhere. While devastating to Bloons, the call inspires nearby Heroes with improved range and cooldowns, and Magic Monkeys extra pierce.

$21,250 — Easy
$25,000 — Medium
$27,000 — Hard
$30,000 — Impoppable

This upgrade unlocks a buff that applies to all Heroes and Magic towers (except itself) within the totem's range if it exists, or the Mermonkey's range if not. It grants Heroes +15% range and -15% Activated Ability cooldowns and grants Magic towers +3 pierce. Additionally, this upgrade increases the range of the Mermonkey (and its totem, by extension) from 32 units to 38 units, the pierce of its trident splashes from 9 to 18, and further enhances its trance attack.

This upgrade reduces the trance attack's cooldown to 3 seconds, increases its damage over time damage cap to 10,000, and allows its totem to be placed onto any valid location on-screen. It also allows the trance to affect BFBs, ZOMGs, BADs, and Boss Bloons: it can pull in and trance BFBs and ZOMGs in the same way as MOABs and DDTs, but against BADs and bosses, it only strips Camo and detonates damage over time, without pulling them in. BFBs, ZOMGs, BADs, and bosses all consume +3 pierce for the trance.

Stats

For a complete list of Mermonkey stats, see Stats:Mermonkey (BTD6).

This data was last updated for: version 55.1

Tower
Display range 28 units Footprint radius 8 units Targeting options First Last Close Strong

Attack
Cooldown 1.2s Offset (X, Y, Z) -0.5, 3.4, 7 Targeting Depends on targeting option Targeting range 28 units Filters Cannot target Camo
Projectile Pierce 2 Speed 200 units/s Lifespan 1s Radius 2 units Filters Cannot hit Camo Splash Pierce 3 Max pierce 3 Damage 2 Damage type Shatter Lifespan 0.05s Radius 3 units Filters Cannot hit Camo Ignores blockers

Buff when in water
Range modifier ×1.35

Related Monkey Knowledge

Mermonkey currently has no Monkey Knowledge specific to it. However, it is affected by Monkey Knowledge specific to Magic and all towers.

Rogue Legends

Starter parties with Mermonkeys

Hero	Insta Monkey 1	Insta Monkey 2	Artifact
Ocean Guardian	2-0-0 Mermonkey	2-0-0 Beast Handler	Portability Common
Fusty the Snowman	2-0-0 Ice Monkey	0-2-0 Mermonkey	Frosted Tips Legendary (adds  2-0-0 Dart Monkey)
Dread Pirate Brickell	0-0-0 Beast Handler	3-0-0 Mermonkey	What In Tarnation Common (adds  1-0-1 Desperado)
Psimbals	0-0-2 Mermonkey	0-3-0 Dart Monkey	Biggest Beacon Legendary (adds  0-1-0 Monkey Village)
Lifeguard Brickell	0-1-1 Mermonkey	0-2-0 Heli Pilot	Summer Fun Rare (adds  0-1-2 Monkey Buccaneer)
Tinkerfairy	2-0-0 Skywarden	0-0-0 Heli Pilot	Fata Morgana Common (adds  0-1-1 Mermonkey)

Related Artifacts

This list does not include Artifacts that affect all Magic towers.

Artifact	Common effect	Rare effect	Legendary effect
Fata Morgana	Mermonkey range, pierce, projectile lifespan, and ability cooldown speed increased 25%. Mermonkey projectiles reflect off map borders. Adds a 0-1-1 Mermonkey to your Party	Mermonkey range, pierce, projectile lifespan, and ability cooldown speed increased 35%. Mermonkey projectiles reflect off map borders. Adds a 0-2-1 Mermonkey to your Party	Mermonkey range, pierce, projectile lifespan, and ability cooldown speed increased 50%. Mermonkey projectiles reflect off map borders. Adds a 0-2-0 Mermonkey to your Party
Follow Me	Dart Monkeys, Boomerang Monkeys, Bomb Shooters, Tack Shooters, Super Monkeys, Druids, and Mermonkeys follow cursor like a Dartling Gunner with a turn rate of 180, and constantly fire as long as Bloons are on screen. Attack speed reduced by 17%	Dart Monkeys, Boomerang Monkeys, Bomb Shooters, Tack Shooters, Super Monkeys, Druids, and Mermonkeys follow cursor like a Dartling Gunner with a turn rate of 300, and constantly fire as long as Bloons are on screen. Attack speed reduced by 9%	Dart Monkeys, Boomerang Monkeys, Bomb Shooters, Tack Shooters, Super Monkeys, Druids, and Mermonkeys follow cursor like a Dartling Gunner with a turn rate of 500, and constantly fire as long as Bloons are on screen. Attack speed reduced by 5%

Costs and sell values

Note: this list does not factor in Monkey Knowledge or other discounts.

Tiers	Total cost				Sell value
	Easy	Medium	Hard	Impoppable	Easy	Medium	Hard	Impoppable
0-0-0	$255	$300	$325	$360	$179	$210	$228	$252
1-0-0	$385	$450	$485	$540	$270	$315	$340	$378
1-1-0	$555	$650	$700	$780	$389	$455	$490	$546
1-0-1	$555	$650	$700	$780	$389	$455	$490	$546
0-1-0	$425	$500	$540	$600	$298	$350	$378	$420
0-1-1	$595	$700	$755	$840	$417	$490	$529	$588
0-0-1	$425	$500	$540	$600	$298	$350	$378	$420
2-0-0	$595	$700	$755	$840	$417	$490	$529	$588
2-1-0	$765	$900	$970	$1,080	$536	$630	$679	$756
2-2-0	$955	$1,125	$1,215	$1,350	$669	$788	$851	$945
2-0-1	$765	$900	$970	$1,080	$536	$630	$679	$756
2-0-2	$1,005	$1,180	$1,270	$1,415	$704	$826	$889	$991
0-2-0	$615	$725	$785	$870	$431	$508	$550	$609
1-2-0	$745	$875	$945	$1,050	$522	$613	$662	$735
0-2-1	$785	$925	$1,000	$1,110	$550	$648	$700	$777
0-2-2	$1,025	$1,205	$1,300	$1,445	$718	$844	$910	$1,012
0-0-2	$665	$780	$840	$935	$466	$546	$588	$655
1-0-2	$795	$930	$1,000	$1,115	$557	$651	$700	$781
0-1-2	$835	$980	$1,055	$1,175	$585	$686	$739	$823
3-0-0	$2,125	$2,500	$2,700	$3,000	$1,488	$1,750	$1,890	$2,100
3-1-0	$2,295	$2,700	$2,915	$3,240	$1,607	$1,890	$2,041	$2,268
3-2-0	$2,485	$2,925	$3,160	$3,510	$1,740	$2,048	$2,212	$2,457
3-0-1	$2,295	$2,700	$2,915	$3,240	$1,607	$1,890	$2,041	$2,268
3-0-2	$2,535	$2,980	$3,215	$3,575	$1,775	$2,086	$2,251	$2,503
0-3-0	$2,315	$2,725	$2,945	$3,270	$1,621	$1,908	$2,062	$2,289
1-3-0	$2,445	$2,875	$3,105	$3,450	$1,712	$2,013	$2,174	$2,415
2-3-0	$2,655	$3,125	$3,375	$3,750	$1,859	$2,188	$2,363	$2,625
0-3-1	$2,485	$2,925	$3,160	$3,510	$1,740	$2,048	$2,212	$2,457
0-3-2	$2,725	$3,205	$3,460	$3,845	$1,908	$2,244	$2,422	$2,692
0-0-3	$2,365	$2,780	$3,000	$3,335	$1,656	$1,946	$2,100	$2,335
1-0-3	$2,495	$2,930	$3,160	$3,515	$1,747	$2,051	$2,212	$2,461
2-0-3	$2,705	$3,180	$3,430	$3,815	$1,894	$2,226	$2,401	$2,671
0-1-3	$2,535	$2,980	$3,215	$3,575	$1,775	$2,086	$2,251	$2,503
0-2-3	$2,725	$3,205	$3,460	$3,845	$1,908	$2,244	$2,422	$2,692
4-0-0	$5,695	$6,700	$7,235	$8,040	$3,987	$4,690	$5,065	$5,628
4-1-0	$5,865	$6,900	$7,450	$8,280	$4,106	$4,830	$5,215	$5,796
4-2-0	$6,055	$7,125	$7,695	$8,550	$4,239	$4,988	$5,387	$5,985
4-0-1	$5,865	$6,900	$7,450	$8,280	$4,106	$4,830	$5,215	$5,796
4-0-2	$6,105	$7,180	$7,750	$8,615	$4,274	$5,026	$5,425	$6,031
0-4-0	$9,115	$10,725	$11,585	$12,870	$6,381	$7,508	$8,110	$9,009
1-4-0	$9,245	$10,875	$11,745	$13,050	$6,472	$7,613	$8,222	$9,135
2-4-0	$9,455	$11,125	$12,015	$13,350	$6,619	$7,788	$8,411	$9,345
0-4-1	$9,285	$10,925	$11,800	$13,110	$6,500	$7,648	$8,260	$9,177
0-4-2	$9,525	$11,205	$12,100	$13,445	$6,668	$7,844	$8,470	$9,412
0-0-4	$8,825	$10,380	$11,210	$12,455	$6,178	$7,266	$7,847	$8,719
1-0-4	$8,955	$10,530	$11,370	$12,635	$6,269	$7,371	$7,959	$8,845
2-0-4	$9,165	$10,780	$11,640	$12,935	$6,416	$7,546	$8,148	$9,055
0-1-4	$8,995	$10,580	$11,425	$12,695	$6,297	$7,406	$7,998	$8,887
0-2-4	$9,185	$10,805	$11,670	$12,965	$6,430	$7,564	$8,169	$9,076
5-0-0	$25,245	$29,700	$32,075	$35,640	$17,672	$20,790	$22,453	$24,948
5-1-0	$25,415	$29,900	$32,290	$35,880	$17,791	$20,930	$22,603	$25,116
5-2-0	$25,605	$30,125	$32,535	$36,150	$17,924	$21,088	$22,775	$25,305
5-0-1	$25,415	$29,900	$32,290	$35,880	$17,791	$20,930	$22,603	$25,116
5-0-2	$25,655	$30,180	$32,590	$36,215	$17,959	$21,126	$22,813	$25,351
0-5-0	$53,315	$62,725	$67,745	$75,270	$37,321	$43,908	$47,422	$52,689
1-5-0	$53,445	$62,875	$67,905	$75,450	$37,412	$44,013	$47,534	$52,815
2-5-0	$53,655	$63,125	$68,175	$75,750	$37,559	$44,188	$47,723	$53,025
0-5-1	$53,485	$62,925	$67,960	$75,510	$37,440	$44,048	$47,572	$52,857
0-5-2	$53,725	$63,205	$68,260	$75,845	$37,608	$44,244	$47,782	$53,092
0-0-5	$30,075	$35,380	$38,210	$42,455	$21,053	$24,766	$26,747	$29,719
1-0-5	$30,205	$35,530	$38,370	$42,635	$21,144	$24,871	$26,859	$29,845
2-0-5	$30,415	$35,780	$38,640	$42,935	$21,291	$25,046	$27,048	$30,055
0-1-5	$30,245	$35,580	$38,425	$42,695	$21,172	$24,906	$26,898	$29,887
0-2-5	$30,435	$35,805	$38,670	$42,965	$21,305	$25,064	$27,069	$30,076

Strategy

For more in-depth strategies, see Strategy:Mermonkey (BTD6).

This section was last updated for: version 56.0

The Mermonkey is a versatile tower that has roles at all stages of a run. It generally suffers from low range, even when placed in water, but stacking Echosense Network can improve this without much additional cost. While viable without water, placing Mermonkeys in water helps in the long run if possible, since it stacks multiplicatively with Echosense.

• The base Mermonkey is one of the most cost-effective starting and earlygame towers due to its Hydra Rocket Pods-style mechanics, high pierce and damage, and reasonable attack speed, allowing it to one- or two-shot most earlygame Bloons.
• Path 1 compresses multiple roles. Its tentacles can eliminate non-Super Ceramic Bloons, its ink stalls lower-tier blimps starting at tier 4, and its pierce buffs mainly support towers with naturally high pierce that still want to use up all their pierce (such as Spike Factories and M.O.A.R Glaives). Lord of the Abyss is notably the only way to add water to maps without water in CHIMPS and some other modes.
• Path 2 focuses on stalling and cleaning up non-blimp Bloons by freezing. Riptide Champion does more damage to Bloons further away and can stall Ceramics over great distances, which remains useful in the lategame for Super Ceramics, but it can't stall White Bloons or Purple Bloons. It benefits the most from Echosense stacking, enabling a strategy of spamming 0-3-2 Riptide Champion to focus on long-distance stalling. Arctic Knight and Popseidon's abilities work best on maps with lots of closed-in walls.
• Path 3's higher tiers are support-oriented, though its lower tiers are more for crosspathing than the higher tiers. Its trance stalls and displaces Bloons in short bursts, including blimps at higher tiers, which can allow towers with area-of-effect attacks to distribute their damage more effectively (especially with Symphonic Resonance by using the trance totem). The main use of the higher tiers is stalling and its unique mechanic that triggers damage over time on Bloons all at once, which is powerful with towers that deal a lot of DoT over very long durations, such as Glaive Lord and The Bloon Solver. It has other minor support functions, including removing camo, buffing other Magic towers' pierce, and buffing Heroes' range and ability cooldowns.

Pre-release

The Mermonkey was first confirmed in the update notes for version 42.0. It was later given an extensive preview in the update notes and accompanying video for version 44.0.

Early access videos

Posted on 28th July 2024

• Boltrix
• Dabloon
• Ethan Reid
• HBomb
• ISAB
• Mehalic POPs
• SJB
• Tewtiy

Update history

For a complete list of Mermonkey changes, see Update history:Mermonkey (BTD6).

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Version 45.0

“

We were cautious with initial low tier Mermonkey upgrades, but as nothing seriously unexpected came up we’ve reduced the base cost and improved the projectile lifespan which should help with issues on some higher tier upgrades.
— Update notes

”

•  Cost reduced ― $600 → $475
•  Trident: Projectile lifespan increased ― 0.5s → 1s

Version 49.0

•  Cost reduced ― $475 → $375

Version 51.0

•  Range bonus when placed in water increased ― +25% → +35%

Version 52.0

“

Last update many players felt blindsided when Brickell stopped applying her buff to Mermonkeys since there was no mention in the balance changes section. We would like to apologize for that - it was tasked internally as a bug as it was indeed unintended to work that way. We then left the issue alone for a long time, mostly due to other more pressing matters, and this issue fell through the cracks. In retrospect, it would have been better to treat this as balance rather than a simple bug fix due to how much time had passed. Reading through your feedback, we did consider just reverting the change, however the bigger issue that the feedback reinforced to us was that players considered Mermonkey to be so bad that it was only a "good" tower when used in combination with a single, water-only hero. This sort of forced synergy goes against our design intentions - namely that Mermonkey being our signature amphibious tower should be able to stand on its own without being balance-locked to an interaction with a single hero. With all that in mind, we feel Mermonkey's highest priority right now is large sweeping buffs to each of the paths, so most of the following changes are our first step towards this starting from the low tier crosspaths.
— Update notes

”

•  Cost reduced ― $375 → $275

Version 54.0

“

Mermonkey ended up somewhat underrated and overbuffed, mid tiers for top and middle paths have really stood out here lately and need to be reigned back in line.
— Update notes

”

•  Cost increased ― $275 → $300
•  Splash: Radius reduced ― 6 units → 3 units

Gallery

For more Mermonkey images, see Gallery:Mermonkey.

Screenshots

This article or section needs more screenshots. See the screenshot guidelines for more information on what screenshots are needed and how to add them.

Assets

• 
  Portrait
• 
  Insta Monkey icon
• 
  Unused buff icon

Promotional images

• 
  44.0 pre-release image
• 
  44.0 Release image

In other languages

This section was last updated for: version 49.2

Name

Language	Text	Notes
Arabic	ميرمانكي	—
Danish	Havabe	—
German	Meeraffe	—
Spanish	Siremono	—
Spanish (Latin America)	Tritomono	—
Finnish	Merenapina	—
French	Siringe	—
Italian	Sirenscimmia	—
Japanese	人魚モンキー	—
Korean	바다원숭이	—
Dutch	Zeemeeraap	—
Norwegian	Havape	—
Polish	Małpka syrenka	—
Portuguese (Brazil)	Macaquático	—
Russian	Морбезьян	—
Swedish	Havsapa	—
Thai	เมอร์มังกี้	—
Turkish	Deniz Maymunu	—
Chinese (simplified)	人鱼猴子	—
Chinese (traditional)	美人魚猴	—

Description

Language	Text	Notes
Arabic	قرد بحري يرمي بالرمح السحري ثلاثي الرؤوس ويستعين بقوة الأعماق لإلحاق الضرر أو الدعم أو تنظيف البالونات. برمائي، لكنه يزدهر في الماء.	—
Danish	Bevæbnet med en magisk trefork kan Havets abe påkalde dybdernes magt til skade, støtte eller bloon-oprydning. Amfibie, men trives i vand.	—
German	Ein magischer, einen Dreizack schleudernder Meeresaffe, der die Kraft der Tiefe herbei beschwört, um Schaden anzurichten, sich Unterstützung zu holen und Bloons wegzuräumen. Amphibisch, aber blüht im Wasser auf.	—
Spanish	Un mono marino mágico que lanza tridentes e invoca el poder de las profundidades para causar daño, brindar apoyo o acabar con los bloons. Es anfibio, pero progresa en el agua.	—
Spanish (Latin America)	Un mono del mar que arroja tridentes mágicos y convoca el poder de las profundidades para causar daño, apoyar al equipo o eliminar bloons. Es anfibio, pero prefiere el agua.	—
Finnish	Maagista atrainta heittävä merten apina kutsuu syvyyksien voimaa vahinkoa, tukea tai bloonien puhdistamista varten. Pärjää maallakin, mutta loistaa vedessä.	—
French	Singe de la mer lanceur de trident magique qui fait appel à la puissance des eaux profondes pour infliger des dégâts, apporter un soutien ou éliminer les Bloons. Amphibie, mais il préfère l'eau.	—
Italian	Una scimmia che brandisce un tridente magico e che invoca il potere degli abissi per infliggere danni, dare supporto o fare piazza pulita di bloon. È un animale anfibio, ma preferisce vivere in acqua.	—
Japanese	魔法の三又槍を投げる海のモンキー。深海の力を使ってダメージを与え、サポートし、ブルーンを一掃する。地上と水中の両方に配置できるが、水中での方がより効果的に活躍する。	—
Korean	심해의 힘을 빌려 마법의 삼지창을 던지며 공격하거나, 다른 원숭이를 지원하거나, 풍선을 처리하는 원숭이입니다. 뭍과 물에 모두 배치할 수 있지만 물에서 더 활약합니다.	—
Dutch	Een magische drietand werpende zee-aap die de kracht van de diepten aanroept voor schade, ondersteuning of het opruimen van Bloons. Amfibisch, maar gedijt vooral in het water.	—
Norwegian	En magisk treforkkastende sjøape som bruker dypets kraft for skade, støtte og bloonrensking. Amfibisk, men trives veldig godt i vann.	—
Polish	Morska małpka rzucająca magicznymi trójzębami. Potrafi wezwać potęgę głębin dla lepszego ataku, wsparcia i zdolności przebijania blonów. W wodzie czuje się najlepiej, ale na lądzie też sobie poradzi.	—
Portuguese (Brazil)	Um macaco do mar arremessador de tridente mágico que chama o poder das profundezas para causar dano, dar suporte ou acabar com Bloons. Anfíbio, mas prospera na água.	—
Russian	Волшебная морская обезьяна, которая может метнуть трезубец и призвать силу глубин, дабы нанести урон, поддержать союзников или зачистить шары. Амфибия, но лучше всего чувствует себя в воде.	—
Swedish	En magisk treuddkastande apa från havet som åkallar kraften från djupet för skada, understöd eller Bloonupprensning. En amfibie, men trivs i havet.	—
Thai	ลิงที่ขว้างตรีศูรวิเศษจากทะเลที่เรียกพลังจากความลึกเพื่อสร้างดาเมจ การสนับสนุน หรือกวาดล้างบลูน ถึงจะเป็นตัวสะเทิ้นน้ำสะเทินบกแต่ก็เก่งที่สุดในน้ำ	—
Turkish	Denizlerin sihirli yaba fırlatıcı Maymunu, hasar vermek, destek olmak veya Bloon’ları temizlemek için derinliklerden gelen gücü çağırıyor. O bir ambifi ama denizde çok başarılı.	—
Chinese (simplified)	一只会投掷魔法三叉戟的海猴子，它能召唤深海的力量来造成伤害，提供支援并清理气球。虽然是两栖动物，但水域依然是它最如鱼得水的地方。	—
Chinese (traditional)	一隻使用魔法三叉戟的海猴子，可召喚深淵的力量來造成傷害、提供支援或清理氣球。雖然牠屬於兩棲塔，但放置在水中時會更加強大。	—