Spectre (BTD6)

BTD5

BTD6

BTDB2

Spectre
General Information
Game	Bloons TD 6
Tower	Monkey Ace
Unlocked at	19,000 XP
Cost	$19,890 (Easy) $23,400 (Medium) $25,270 (Hard) $28,080 (Impoppable)
Activated Ability	N/A
Targeting Options	Circle, Figure Infinite, Figure Eight, Centered Path, Wingmonkey with Monkey Knowledge Reverse Flight available for all except Wingmonkey Aiming locked to First.
Camo Detection	Restricted (upgradable to 0-2-4)
Popology
Damage Type(s)
Neva-Miss darts: Sharp Orbital Spray 8x Straight Attack Weak Seeking Path-Based Mobility Flying Extra Damage Dart: Sharp Single Projectile Straight Attack WeakSeeking Per-Shot Basis (alternates with Dart) Path-Based Mobility Flying Extra Damage Extra Damage to Ceramics Shell: Explosion Single Projectile Straight Attack Weak Seeking Per-Shot Basis (alternates with Dart) Path-Based Mobility Flying Area of Effect Extra Damage Extra Damage to Ceramics For further details, refer to #Attack Interactions
Statistics
Damage	3 (Neva-Miss darts) 4 (dart) +1 (dart, Ceramic) 3 (bomb) +3 (bomb, Ceramic)
Pierce	8 (Neva-Miss darts) 10 (dart) 20 (bomb, x-0-4) 35 (bomb, 0-1-4)
Attack Speed	Moderate (Neva-Miss darts, 0-x-4, every 1.68s, e.a.u.) Moderate (Neva-Miss darts, 1-0-4, every 1.26s, e.a.u.) Extremely Fast (darts and bombs, 0-x-4, every 0.06s, separately targeting streams with darts and bombs) Extremely Fast (darts and bombs, 1-0-4, every 0.045s, separately targeting streams with darts and bombs)
Range	80 (Circle Path, clockwise, around base) 40, 40 (Figure Eight, ccw lc, cw rc, pattern towards base) 40, 40 (Figure Infinite, ccw uc, cw dc, pattern towards base) 90 (Centered Path, clockwise, around map centre)
Status Effects	N/A
Tower Boosts	N/A
Income/Life Boosts	N/A
Path Upgrades
← Previous	Neva-Miss Targeting
← Previous	Neva-Miss Targeting
Current	Spectre
Current	Spectre
Next →	Flying Fortress
Next →	Flying Fortress
Path Info
Path	3
Path	3
Upgrade Tier	4
Upgrade Tier	4
Related upgrades
Spectre (BTD5), for the BTD5 counterpart
[Source]

“	Rapidly fires darts and bombs, dominating most Bloon types easily.	”
	~ In-game description

Spectre is the fourth upgrade of Path 3 for the Monkey Ace in Bloons TD 6. The Spectre keeps the Neva-Miss Targeting homing darts, but also fires a single stream of rapidly alternating darts and bombs. These homing darts and bombs slightly seek at bloons. It fires 15 times per second (one projectile every 0.06s, or 0.045s with Rapid Fire). Additionally, each of the Spectre's Neva-Miss homing darts deals 3 damage and last 50% longer (from 600 to 900 units).

Each dart from the projectile stream deals 8 damage and has 4 pierce, while each bomb deals 3 damage and +5 extra Ceramic damage and has 20 pierce (35 pierce with Exploding Pineapple) with a blast radius of 20 (+3 with Exploding Pineapple). However, unlike in BTD5, the Spectre's bombs do not harm Black Bloons, so it cannot damage DDTs without a Monkey Intelligence Bureau or similar upgrades, even if it has camo detection. The Neva Miss Targeting darts remain the same, lacking any lead-popping to counter DDTs without support. Also, the Spectre upgrade is now split from the Rapid Fire upgrade path, which may potentially force either external camo detection for an attack speed bonus or internal camo detection in exchange for no additional attack speed bonus.

This upgrade costs $19,890 on Easy, $23,400 on Medium, $25,270 on Hard, and $28,080 on Impoppable. If this tower is nearby Level 6+ Rosalia's workshop, this upgrade costs $17,900 on Easy, $21,060 on Medium, $22,745 on Hard, and $25,270 on Impoppable.

Description

Overview

Spectre shooting barrages of darts and bombs, plus homing darts

Spectre is a much larger plane than its predecessor, changing it from a biplane to a large black monoplane with four red engines, while retaining the signature red and blue roundels. Its artwork shows it dropping twin lines of bombs painted green with yellow stripes, similar to Mortar Monkey shells, however, in-game it actually fires the orange-striped darts of its previous upgrades and dark grey bombs bearing a red nose.

Spectre rapidly shoots alternating darts and bombs that deal greater damage, including extra Ceramic damage. These darts and bombs have slight homing. Additionally, the Neva-Miss attack is kept and does extra base damage.

Targeting Priorities

Like all Monkey Aces, Spectre uses flight patterns as its targeting priority settings. It can also access Centered Path targeting option due to being an upgrade from the respective upgrade that grants it.

• Circle: Flight pattern becomes a circular path around the runway.
• Figure Infinite: Flight pattern becomes the shape of the infinite symbol (∞). As the Monkey Ace flies, it will pass its runway during its flight, specifically at each half of the whole flight path.
• Figure Eight: Flight pattern becomes the shape of the number 8. As the Monkey Ace flies, it will pass its runway during its flight, specifically at each half of the whole flight path.
• Centered Path: Flight path becomes a large circular path, centered around the center of the map by default. The center of the flight path can be changed manually. Can be accessed by purchasing the Centered Path upgrade, and once upgraded the Ace defaults to this target priority.
• Wingmonkey: Instead of a fixed flight path, the Monkey Ace will attempt to fly as close to the path as possible, similarly to an Aircraft Carrier Plane. Available only via the Wingmonkey MK.
• Reverse Flight: Shown by an icon of a reverse aircraft, the Ace will reverse direction of flight. Unlike other target priorities such as Change Hands, there is a cooldown of 5 seconds before being able to reverse flight direction again. It can be coupled with all flight options except Wingmonkey.

Spectre's alternating dart-and-bomb attacks is locked to First, and both the darts and bombs can home weakly at bloons.

Full Popology

Statistics

Updated as of Version 51.2

Base stats

• Landing Base has a rectangular footprint of 28x18. "Dummy range" of 22. Upon placement, spawn Monkey Ace as the main tower.
• Monkey Ace moves in a fixed pathway around its base, flying above all obstacles. Creates Barrage projectile from center of Monkey Ace and targets the first bloon. Automatically generate Homing Dart from the center of the Ace according to its attack cooldown value.
  • Circle: circular loop of 80 radius, center is the runway
  • Figure-Eight: figure-eight loop of (40, 40) radii, center is the runway
  • Figure-Infinite: figure-infinite loop of (40, 40) radii, center is the runway
  • Centered Path: circular loop of 90, center defaults in center of map or any user-set center
• Neva-Miss Dart:
  • Projectile, sharp type, spray of 8, 1.68s attack cooldown, moderate homing, 3 damage, 8 pierce. Total projectile distance of 900.
• Barrage:
  • 0.06s attack cooldown, locked on First, alternates between launching Dart and Shell.
• Dart:
  • Projectile, sharp type, infinite range, applies weak homing, 0.06s attack cooldown, 8 damage, 10 pierce. Locked on First, alternates every odd shot.
• Shell:
  • Projectile, explosion type, infinite range, applies weak homing, 20 blast radius, 0.06s attack cooldown, 3 damage, +5 Ceramic damage (8 total Ceramic damage), 20 pierce. Locked on First, alternates every odd shot.

Crosspathing interactions

• 1-0-4: Barrage attack cooldown (alternates between Dart and Shell) reduced from 0.06s to 0.045s. Homing Dart attack cooldown reduced from 1.68s to 1.26s.
• 2-0-4: Neva-Miss Dart projectile count increased from 8 to 12.
• 0-1-4: Shell pierce increased from 20 to 35, blast radius of Shell increased from 20 to 23. Adds passively spawning Pinapple attack.
• 0-2-4: Gains camo detection, Dart, Shell, and Neva-Miss Dart gain +1 damage to Camo Bloons.

Monkey Knowledge interactions

• Airforce Upgrades: All T3+ Monkey Aces get +1 pierce.
  • Base Neva-Miss darts pierce increased from 8 to 9.
  • Dart pierce increased from 10 to 11.
  • Shell (x-0-4) pierce increased from 20 to 21.
  • Shell (0-1-4 and 0-2-4) pierce increased from 35 to 36.
• Elite Military Training: All Military Monkeys get a one-off +1000 XP and earn XP in-game 5% faster permanently.
• Accelerated Aerodarts: Darts from Monkey Aces fly faster.
  • Darts fly 50% faster.
• Gun Coolant: Monkey Aces attack 10% faster.
• Wingmonkey: Grants all Monkey Aces with a new target priority that allows it to fly around the screen like the planes from the Aircraft Carrier.
• Military Conscription: First military tower costs only ⅔ of the original cost.
  • Monkey Ace base cost from $680, $800, $865, and $960 → $455, $535, $580, and $645 on Easy, Medium, Hard, and Impoppable, respectively.
• Advanced Logistics: All Military Monkeys base costs reduced by 5%.
  • Monkey Ace base cost from $680, $800, $865, and $960 → $645, $760, $820, and $910 on Easy, Medium, Hard, and Impoppable, respectively.
    • If Military Conscription is also enabled, the final cost will be $420, $495, $535, and $595.
• Monkey Education: All Monkeys XP earn rate increased by 8%.
• Better Sell Deals: All Monkeys sell for 5% more. Increases sell potency from 70% to 75%.
• Veteran Monkey Training: All Monkeys reload time reduced by 3%.

Attack Interactions

See also: Attack Interactions/Bloons TD 6/Military

Updated as of Version 51.2

Base attack(s)

• Neva-Miss Dart:
  • Sharp
  • Orbital Spray (8)
  • Straight Attack
  • Weak Seeking
  • Path-Based Mobility
  • Flying
  • Extra Damage (3)
• Dart:
  • Sharp
  • Single Projectile
  • Straight Attack
  • Weak Seeking
  • Per-Shot Basis (alternates with Shell)
  • Path-Based Mobility
  • Flying
  • Extra Damage (8)
• Shell:
  • Explosion
  • Single Projectile
  • Straight Attack
  • Weak Seeking
  • Per-Shot Basis (alternates with Dart)
  • Path-Based Mobility
  • Flying
  • Area of Effect
  • Extra Damage (3)
  • Extra Damage to Ceramics (+5)

Costs

Updated as of Version 51.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.

[Module | Data]	Purchase				Sell
Costs	Easy	Medium	Hard	Impoppable	Easy	Medium	Hard	Impoppable
Upgrade (X-X-4)	$19,890	$23,400	$25,270	$28,080	-
Total (0-0-4)	$23,625	$27,800	$30,025	$33,360	$16,538	$19,460	$21,018	$23,352
Crosspath (1-0-4)	$24,005	$28,250	$30,510	$33,900	$16,804	$19,775	$21,357	$23,730
Crosspath (2-0-4)	$24,470	$28,800	$31,105	$34,560	$17,129	$20,160	$21,774	$24,192
Crosspath (0-1-4)	$23,795	$28,000	$30,240	$33,600	$16,657	$19,600	$21,168	$23,520
Crosspath (0-2-4)	$24,090	$28,350	$30,620	$34,020	$16,863	$19,845	$21,434	$23,814

This upgrade's prices (or included crosspath's prices) are affected by the following MK: Military Conscription, Advanced Logistics, Better Sell Deals

Strategy

Summary

Due to the Spectre's high pierce and damage, as well as its global range and flight, the Spectre excels in the mid-game for the purpose of dispatching heavy threats of bloons and inflicting high general damage. Its global range makes it viable on maps that offer a lot of length for Spectre to utilize, maximizing use of its rapid-fire shots to continuously barrage at bloons. Spectre can very quickly dispatch heavy bloon rounds such as Rounds 63, 76, and 78, and clear out high-density bloon formations with ease. However, Spectre tends to fall off in the late-game, even with its increased damage to Ceramics that aim to dispatch Super Ceramics. Additionally, it isn't very effective against Fortified Bloons, since much of its power relies on demolishing swarms of weaker bloons quickly, rather than gradually breaking up tougher layers.

In the late-game, specifically Rounds 81+ from which Super Ceramics replace ordinary Ceramics, the Spectre changes its role from a mid-game breezer into a general high DPS tower, no longer trivially demolishing bloons in less than a second; It is, however, very inefficient for its price at this role, so it is not advised to purchase Spectre past Round 80 outside of going into Flying Fortress.

Note that the Spectre may still miss bloons due to the long travel time of its projectiles; adding slowdown support such as Bloon Sabotage or Glue Hose, or simply micromanaging the Spectre's flight to keep it closer to its targets, will help the Spectre not miss so often. Usage of the Spectre is viable in the late-game when paired with a lot of support, such as Dark Dungeons CHIMPS, however most of the airborne T5's such as the Sky Shredder paired with Stronger Stimulant and the Apache Prime outclass the Spectre in this regard.

Tips

• It is usually better off getting 2-0-4 Spectre as opposed to 0-2-4 Spectre. Rapid Fire adds 33% extra attack speed, which makes a big difference thanks to the Spectre's already-high DPS. The Lots More Darts crosspath does not add any extra darts for the Spectre's streams but they do still increase the numbers of darts from the improved Neva-Miss Targeting attack.
• On Rounds 81+, where subsequent rounds change Ceramics into Super Ceramics that have a set amount of extra health plus extra speed per round, Spectres tend to fall back on power against fast if their bombs do not hit them. However, this can be remedied by placing the Spectre's flight path to one that is more closely placed near the targeted bloons.
• Spectre cannot damage DDTs normally. MIB is the best way to fix this since it allows both its darts and bombs to hit DDTs.
  • Spectre darts having 12 pierce makes it a perfect Call to Arms target, and +10 pierce on bombs can make sure they don't pierce cap.
• Usually, Spectre micromanagement strategies attempt to keep the Spectre shooting down a straight line or hitting multiple bloons to make full use of its darts' high pierce.
• Pairing the Spectre with Overclock is a very good idea, since it allows it to keep up with fortified superceramics and MOABs. Overclock's buff also has full uptime on all Tier 4 upgrades, meaning that the 66% attack speed buff is constant on Spectre.
• The Spectre appreciates both direct support, in the form of damage buffs from Pat Fusty's Rallying Roar and Permanent Brew, but also bloon control such as MOAB Glue and other Glue Gunners, Bloon Sabotage, or Downdraft.
• The Spectre's barrage attack always target First, whereas the ordinary Neva-Miss attack tend to home towards the closest bloons. During the late-game, focus on destroying any bloons far from or otherwise unfavorable for the Spectre, so it will not waste its shots on missing targets.
• Make use of the Centered Path flight path to adjust where Spectre will fly around. This will change the angle at which it will make shots; correctly angling the Spectre helps it not miss so often.

Bugs

Current

None (so far)

Patched

• [34.0] The homing change to spectre only affects it if it does not have any crosspaths. Possibly patched by 37.3.
• [38.0] There was a bug where Spectre can ignore Phayze's active camo immunity with any crosspath. This also included Flying Fortress. This was patched in 39.0.

Version History

Balance Changes

Before Version 4.0, Spectre was much more powerful than the Apache Dartship for less price. Now, with a very slight nerf to Spectre (but with no change to the Flying Fortress by extension) along with an Apache Dartship price drop has made the Spectre a little more on even grounds. In Version 8.0, Spectre was nerfed in price but with a damage buff to compensate, mainly to counteract the easy Deflation wins.

Version 23.0 introduced a small buff to Spectre darts, while Version 28.0's rework by increasing Ceramic damage over a reduced dart and bomb pierce is an overall buff, as Spectre bombs have huge pierce anyway that giving both dart and bomb attacks with bonus Ceramic damage still makes a big impact on the most dangerous grouped mid-game rounds anyway.

As many other mid-game DPS excel towers and combinations have evolved, the Spectre has seen less usage on CHIMPS outside of special challenges, mainly with the issue of high cost with generally low value in the late-game. In addition, Spectre has seen general reworks to increase its relevance in the late-game and increase value of middle crosspath as a piercing option.

Update 41.0 readded the Neva-Miss radial attack that is normally lost in exchange for direct targeting.

4.0

• Spectre attacks 16.67% slower than normal, base attack cooldown increased from 0.05s to 0.06s.

8.0

• Spectre darts deal more damage (1 → 2)
• Spectre bombs deal more damage (2 → 3)
• Spectre costs more ($18,000 → $24,000)

23.0

“	[...] In addition to this we are experimenting with adding a small amount of homing to the spectre upgrade as rapid fire missing is not the intended design.	”
	~ Ninja Kiwi

• Spectre darts now have a slight homing effect.
• Spectre dart projectile size increased (2 → 3)

27.0

“	Now allows you to find your center. Very zen.	”
	~ Ninja Kiwi, referring to Centered Path

• Affected by Centered Path special targeting buff

28.0

“	Monkey Ace has had an overall rework to a lot of different upgrades in order to highlight the x1x Exploding Pineapples upgrade as a buff to all explosives, in addition to this Spectre has been reworked to have less base pierce but a higher damage bonus to Ceramic Bloons in order to make the new option of a pierce crosspath more viable while also allowing it to carry on better into the endgame against Super Ceramics.	”
	~ Ninja Kiwi, referring to both Exploding Pineapple rework and Spectre rework

• Spectre dart damage deals +2 damage to Ceramics, for 4 damage versus Ceramics instead of 2.
• Spectre dart pierce reduced from 30 to 15
• Spectre bomb damage deals +2 damage to Ceramics, for 5 damage versus Ceramics instead of 3.
• Spectre bomb pierce without Exploding Pineapples reduced from 60 to 30
• 0-1-4 Spectre bomb pierce reduced from 60 to 45
• 0-1-4 Spectre bomb radius increased from 20 to 23

30.0

“	More of a straight quality of life, Ace has gained a new special toggle button to allow it to turn back and fly in reverse on any selected flight pattern. [...]	”
	~ Ninja Kiwi, referring to Reverse Flight

• Monkey Ace can now toggle flight direction for any pattern.

32.0

“	Neva-Miss has been generally over performing for quite a cheap T3, increasing price here slightly but not carrying that increase up through higher tiers.	”
	~ Ninja Kiwi, referring to Neva-Miss Targeting

• Spectre price reduced from $24,000 to $23,400
  • Overall price is $0 due to $600 price increase to Neva-Miss Targeting.
• [bug fix] Spectre no longer misses bonus ceramic damage on darts

33.0

“	To help you work towards the new Ace Paragon we have reduced Spectre’s lategame ceramic weakness with improved targeting for the bomb projectiles & a large increase to their bonus Ceramic damage to help out later on, to change focus on these projectiles we have also shifted damage around for the darts to deal single target with the bombs providing ceramic AoE cleanup. [...]	”
	~ Ninja Kiwi

• Spectre darts & bombs now both have a weaker homing effect
  • [undocumented] Spectre darts angular speed decreased (80 → 20)
  • [undocumented] Spectre bombs angular speed decreased (0 → 10)
• Spectre darts deal more damage (2 → 3)
• Spectre bombs deal less damage (3 → 2)
• Spectre bomb damage deals more bonus damage to Ceramics (+2 → +4)

34.0

“	[...] Same as mentioned above for the flagship, we are experimenting with new homing changes for the Spectre & Flying Fortress to improve their feeling. [...]	”
	~ Ninja Kiwi

• Spectre's projectiles now use a new homing style that matches similarly to Goliath Doomship

37.0

“	Spectre is shifting a little of the ceramic bonus around into basic all damage at the cost of reduced pierce, which should make up for lack of single target damage while also making the pierce crosspath more necessary when being used for cleanup focus.	”
	~ Ninja Kiwi

• Spectre Dart damage increased from 3 to 4
• Spectre Dart ceramic bonus reduced from +2 to +1
  • Overall damage of the darts against Ceramics remains at 5.
• 0-x-4 Spectre Dart pierce reduced from 15 to 10
• 2-0-4 Spectre Dart pierce reduced from 18.75 to 12.5
• Spectre Bomb damage increased from 2 to 3
• Spectre Bomb ceramic bonus reduced from +4 to +3
  • Overall damage of the bombs against Ceramics remains at 6.
• x-0-4 Spectre Bomb pierce reduced from 30 to 20
• 0-1-4 Spectre Bomb pierce reduced from 45 to 35

41.0

“	[...] Neva-Miss itself is too fun and cool to be lost completely on the very next upgrade so it's coming back to Spectre as an additional attack, as this main attack is back again 204 no longer needs to give an additional conflicting crosspath benefit. [...]	”
	~ Ninja Kiwi

• Spectre now keeps the original Neva-Miss Targeting attack alongside its rapid-fire dart-and-bomb barrages, additionally increasing damage of its Neva-Miss Targeting darts from 1 to 3.
• 2-0-4 Spectre no longer gains +25% pierce for darts

46.0

“	As efforts to improve the feeling of top path Buccaneer have gone relatively well, projectile seeking has now been greatly improved for the Bottom path Ace as well.	”
	~ Ninja Kiwi

• Spectre's Neva-Miss Targeting dart seeking improved to match Adora. Now, all shots have tighter homing that can accelerate within close angular proximity to targets, or decelerate if not.
• [undocumented] Spectre's Neva-Miss Targeting dart projectile lifespan decreased from 3.33s to 1.5s
• Spectre targeted dart attack seeking improved: turning rate and targeting angle no longer capped (180°/s, 30°)

46.1

• [undocumented] Spectre's Neva-Miss Targeting dart lifespan decreased from 1.5s to 1.0s
  • Note: Ninja Kiwi implemented this change in 46.1 despite documenting it for 46.2.

48.0

“	[...] Neva-Miss darts max speed and homing acceleration is being increased so the projectiles are less likely to expire before meeting their target unless placement is terrible.	”
	~ Ninja Kiwi

• Affected by Neva-Miss buffs

50.0

“	[...] Since Spectre works best at the edge of the map far from the entrance the radial attack can expire too early, so projectile distance has been increased. Spectre likes to be placed close to the edges of the map	”
	~ Ninja Kiwi

• x-x-4 Spectre radial projectile distance increased from 600 to 900

51.0

“	Spectre is trying a new approach: darts are trading in pierce for higher single-target damage, while bombs lean more into AoE Ceramic cleanup to improve overall efficiency. These changes are mirrored on the Flying Fortress to keep the behavior consistent.	”
	~ Ninja Kiwi

• Spectre barrage dart pierce decreased from 10 to 4
• Spectre barrage dart damage increased from 4 to 8
• Spectre barrage dart no longer does +1 Ceramic damage
• Spectre barrage bomb bonus Ceramic damage increased from +1 to +5

Extra Notes (Version History)

• Version 44.0 buffed Rosalia's Level 6+ discount from 5% to 10%, which changed the prices of Neva-Miss Targeting when buffed by her:
  • Easy: $18895 → $17900
  • Medium: $22230 → $21060
  • Hard: $24010 → $22745
  • Impoppable: $26675 → $25270

Gallery

In-game model

Spectre without Path 1 upgrades attacking in BTD6 (after 4.0 update). This Spectre is 0-2-4

204 Spectre in BTD6 (bottom)

Crosspathing (Top: Path 1, Bottom: Path 2)

Spectre's light homing, demonstrated

Enough XP to unlock Spectre

2-0-4 Spectre homing in v37.3 (v34.0 homing changes)

0-0-4 Spectre homing in v37.3 (v34.0 homing changes)

2-0-4 Spectre chasing Super Ceramics on Round 222 (v34.0 homing changes)

Radial Neva-Miss attack introduced in version 41.0.

Spectre v46.0 new homing barrage dart

Spectre shooting barrage, and Neva-Miss attack not visible

Official artwork

Upgrade portrait

Upgrade icon

Instamonkey icon

Projectiles

Spectre's darts

SpectreBomb.png

3D render of Spectre's bomb

Videos

Spectre 23.0

First iteration of the at-the-time new Spectre homing in 23.0

Rocket Storm spread, plus Spectre and Flying Fortress original attacks 40.2

Pre-41.0 Spectre with only dart-and-bomb barrage

Trivia

• The nerfed attack speed Spectre with Rapid Fire shoots at approximately the speed of the Spectre in BTD5.
• Use of a 0-2-4 Spectre formerly was a simple go-to strategy for almost all Deflation Mode maps, but this was no longer possible in Version 8.0, where the Spectre's price was increased, but it also received increased overall damage to compensate.
• The BTD5 Spectre upgrade uses an ambiguous description ("Flying fortress of bloon doom"), but in BTD6, the description for the Spectre is fully described in terms of how it attacks ("Rapidly fires darts and bombs, dominating most Bloon types easily").
• The darts from the Spectre are 2D models, while the bombs are 3D models.
• The Spectre is based on the Lockheed AC-130H Spectre.
• There are three window panes on the BTD6 Spectre, while the BTD5 Spectre in both the Flash and Mobile versions had only one wider pane.
• A "spectre" is a type of ghost or a phantom. Alternatively, it means a "mental image of something unpleasant or menacing" (Dictionary.com definition) or "the idea of something unpleasant that might happen in the future" (Cambridge Dictionary definition). Regardless of how the word "spectre" may be interpreted, the Spectre's dark color scheme and high DPS closely matches the level of ferocity that its name may suggest.