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High damage spikes become almost permanent.
~ In-game description

Perma-Spike (sometimes referred to as Permaspike) is the fifth and final upgrade of Path 3 for the Spike Factory in Bloons TD 6. Although it produces spike piles at a significantly slower rate (from every 1.75s to every 6.06s, excluding Path 2 crosspaths), it produces much more powerful spike piles that pop up to 50 bloons per pile (90 bloons with Bigger Stacks) and deal 10 damage per spike for a maximum of 500 damage per spike pile (900 with Bigger Stacks), making it extremely powerful for stockpiling spikes. Despite the name, but in accordance with the upgrade's description, the spikes are not actually permanent. The spikes last between rounds and have a longevity of 4 rounds each or 300 seconds, whichever comes first. Additionally, its Smart Spikes 4x start-of-round speed boost is increased from 3s to 10s, to account for its very slow production rate. Unlike all other Spike Factories, spikes from the Perma-Spike are able to save state in game saves.

This upgrade costs $25,500 on Easy, $30,000 on Medium, $32,400 on Hard, and $36,000 on Impoppable.



Spikebottom (5)

Perma-Spike with some pre-placed spike piles

Perma-Spike is a much larger tower than its predecessor, with a primarily yellow color scheme, particularly for its four supports and connecting ring surrounding a grey main body; it also retains the four gears of Deadly Spikes.

The spike piles themselves are now each a short yellow base bearing four vertical spikes and a spike on each corner; the base now also bears a few rivets.

These piles turn blue with glowing yellow and white when paired with White Hot Spikes.

Perma-Spike greatly improves the damage and pierce all its spike piles, dealing 10 damage per spike and having 50 spikes per spike pile (or 90 with Bigger Stacks). However, spike piles are produced much slower, down to 6.06s without Path 2 benefits. Spike piles become larger and can now carries over up to three rounds instead of two, and last for 300 seconds, lasting up to 4 rounds or 300 seconds, whichever comes first. The spike carryover benefit has no effect on Apopalypse, but has effect on Boss Bloon Events. Perma-Spike also magnifies the benefits of Smart Spikes, inheriting its start-of-round attack speed boost and extending its duration up to 10 seconds; this helps offset the tower's otherwise abysmal attack rate.

Targeting Priorities[]

Perma-Spike defaults on Normal targeting priority, which dispenses the spikes onto nearby bloon track in a semi-sporadical behavior. Because it already has Smart Spikes, it will also receive Close, Far, and Smart.

  • Normal: Targets spike piles in a somewhat sporadical way, spreading spikes as evenly as possible within its range.
  • Close: Targets the closest region(s) of track within range.
  • Far: Targets the furthest region(s) of track within range.
  • Smart: Prioritizes the track with the Bloon the farthest through it, then targets the spot on that track closest to the exit.


Updated as of Version 43.0. 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-5) $25,500 $30,000 $32,400 $36,000 -
Total (0-0-5) $30,980 $36,450 $39,365 $43,740 $21,686 $25,515 $27,556 $30,618
Crosspath (1-0-5) $31,660 $37,250 $40,230 $44,700 $22,162 $26,075 $28,161 $31,290
Crosspath (2-0-5) $32,170 $37,850 $40,880 $45,420 $22,519 $26,495 $28,616 $31,794
Crosspath (0-1-5) $31,490 $37,050 $40,015 $44,460 $22,043 $25,935 $28,011 $31,122
Crosspath (0-2-5) $32,170 $37,850 $40,880 $45,420 $22,519 $26,495 $28,616 $31,794

This upgrade's prices (or included crosspath's prices) are affected by the following MK: FirstLineOfDefenseIcon First Last Line of Defense, BetterSellDealsIcon Better Sell Deals


Main article: Perma-Spike/Strategies


Perma-Spike is exceptionally powerful when very careful spending and stalling techniques are implemented, due to the nature of this tower. Spikes last extremely long, making optimization of stockpiling techniques a major necessity for maximizing the true power of Perma-Spike. The role of Perma-Spike mainly comes into play during the late-game to tank a substantial amount of bloons, working very well on maps with only one exit.

Perma-Spike relies heavily on stockpiling its spikes effectively through various means of stalling. Too little stalling and its stockpile depletes too quickly. Too much Bloons tanked at once and its stockpile depletes to dangerously low levels.


  • Perma-Spike is very effective on single-exit maps when placed near the end of the bloon track. Then, spikes will not be used up immediately, allowing spike stockpiling to slowly make the tower more and more valuable.
  • The choice of crosspaths depends on the defense. Having the Path 1 Upgrades (Bigger Stacks and White Hot Spikes) has a slightly higher stockpile value over the Path 2 Upgrades (Faster Production and Even Faster Production). Bigger Stacks increases its pop count per spike from 500 to 900 (+80% total bonus) versus the Path 2 upgrades which improve spike production speed by a total of +79%. By purchasing Even Faster Production, the Perma-Spike produces an equivalent of 893 spikes per 6.06s, recharges faster, and synergizes with buffs better.
    • 1-0-5 very slightly edges 0-2-5 at spike production, specifically by +80% instead of +79%, but the 0-2-5 crosspath has a better refresh rate and synergizes better with buffs than the Bigger Stacks crosspath.
    • An Acidic Mixture Dip not within the range of any other tower should suffice to allow lead/DDT popping, and higher tiers provide extra popping power.
    • If needed, a Monkey Intelligence Bureau will guarantee all spikes pop lead and can buff other towers in its radius.
    • One benefit of 1-0-5 is that it is cheaper than 0-2-5 for minimal drawback in CHIMPS scenarios.
  • Overclock works exceptionally well with Perma-Spike and even more so when paired with Stronger Stimulant. In fact, it is still slow enough not to consume Alchemist buffs faster than can be re-supplied.
  • Even though Perma-Spike spike piles are saved upon leaving and re-entering a game save, any applied buffs on each spike pile do not save. This is especially important for Acidic Mixture Dip.
  • Be cautious with using Snowstorm or adding ice monkeys near the spike pile, as Perma-Spike without White Hot Spikes or MIB cannot affect frozen MOABs, allowing them to cross Perma-Spike undamaged, especially if using 'smart' targeting, where all spikes end up in one pile. Note that Acidic Mixture Dip cannot grant frozen-popping, despite granting lead-popping.
  • Due to the nature that occasional server reconnections may be caused by the extreme lag on the device, even if the spike piles can be saved, it is better off not using Perma-Spike for Co-Op Mode.
    • Likewise, relying on Perma-Spike to beat rounds with DDTs pretty much have to be done within just one run due to Acidic Mixture Dip not saving upon map reloads. Thus, if the player loses all spikes on rounds like 90, 93, 95, and 99, they are likely doomed to lose as reloading for another try will result in the DDTs eating all of the spikes that were placed earlier and ending the game.
  • For Ranked Bosses, Perma-Spike formerly had a dominant role, especially against Bloonarius, Gravelord Lych, and Dreadbloon, as it can instakill bosses extremely quickly if placed not at the very spawn point of the Boss. Since Bosses now clear all projectiles on screen before starting each boss battle, Permaspike's relevancy in ranked runs is no longer extremely dominant.
    • Spike piles can only use up one pierce per frame, thus 0-2-5 is always better for optimized runs. 2-0-5 is better for more casual tier 1 Dreadbloon runs, though, as spikes lose all buffs when reloading a save.
  • Getting a full stockpile from a Perma-Spike that doesn't utilize its Smart Spikes start-of-round bonus isn't super advantageous compared to one that does, but it is still worth doing large stalls to restore old spikes.
    • Assuming no speed buffs were added, without Path 2 crosspaths is roughly 49.50 spikes, 0-1-5 is roughly 61.85 spikes, and 0-2-5 is roughly 88.24 spikes.

Version History[]

Balance Changes[]

Overall, Perma-Spike has been nerfed heavily overall since it was first released. Initially, it was considered one of the most overpowered upgrades in the game due to the 0-2-5 Perma-Spike's capability to solo until around the early 90's when given sufficient lead-popping support, all for a very low cost. Its power was reduced drastically in Version 2.0, but remained a useful upgrade for tanking various types of bloons in the late-game. Throughout later updates, it got a few nerfs but gained a few quality-of-life buffs for Perma-Spike itself, plus steady pierce buffs for the weaker 2-0-5 crosspath.

v36.0 nerfed it with an overall 25% damage reduction through reduced pierce but increased damage, which had a side effect of making the Perma-Spike significantly worse against ceramics by spawning more children bloons with its damage, but consuming more pierce as a result, weakening the Perma-Spike's pre-freeplay potential if unsupported. This can be circumvented by giving the Perma-Spike Stronger Stimulant, and then because the alchemist also provides Acidic Mixture Dip for a total of +2 damage against ceramics, weakening ceramics with at least one point of damage causes only one pierce to be consumed and turning the nerf into a strength. This was reverted in v38.0, instead favoring a bigger speed penalty with only a longer duration Smart Spikes bonus to compensate.

The above changes would eventually be reverted in v38.0, as Ninja Kiwi instead opted to nerf Perma-Spike's attack speed instead, giving an overall increase in DPS while maintaining similar damage consistency, whilst discouraging extreme stalling.

Permaspike was previously an extremely popular option against T1 Bosses (specifically Bloonarius, Lych, and Dreadbloon) for speedrunning, even after the v36.0 rework, but has since become irrelevant in v37.0 where Bosses instantly destroy projectiles upon spawning.

  • NERF Perma-Spike price increased ($22,000 → $25,000)
  • NERF Perma-Spike now attacks twice as slow (3.0s → 6.0s)
  • BUFF Permaspike with Bigger Stacks now has larger stacks (60 → 70; effectively now up to 700 damage per spike pile for Permaspike with Bigger Stacks).
  • NERF Perma-Spike duration decreased (350s → 300s)
  • NERF Perma-Spike price increased ($25,000 → $30,000)
  • NERF Perma Spike max rounds reduced (4 → 3)
  • BUFF Perma-Spike spike piles can now be saved (i.e. on any type of game save, including Co-Op saves)
  • BUFF Perma-Spike now attacks 4x as fast for the first 2.5s of a round.
  • BUFF [Undocumented] Perma-Spike lifespan increased (3 → 4) by the Deadly Spikes round duration buff.
Like a few other towers before it, the attack speed crosspath for Spike Factory has outshined the others. We have reworked the lower Spike Factory tiers to distribute this power more evenly while keeping high tier factories at a similar level of power.
~ Ninja Kiwi
  • NERF [Undocumented] 0-1-5 Perma-Spike attack cooldown increased (3.6s → 4.8s)
  • NERF [Undocumented] 0-2-5 Perma-Spike attack cooldown increased (2.7s → 3.36s)
  • Note: Perma-Spike's base attack speed remained the same, which meant the attack speed crosspaths were nerfed.
  • BUFF Base Perma-Spike attacks faster (6.0s → 4.85s)
  • BUFF 0-1-5 Perma-Spike attack cooldown decreased (4.8s → 3.88s)
  • BUFF 0-2-5 Perma-Spike attack cooldown decreased (3.36s → 2.72s)
[...] In addition, Permaspike's neglected crosspath has had a small pierce increase as currently their only real use is under custom challenge rules.
~ Ninja Kiwi
  • BUFF 1-0-5 Perma-Spike pile pierce increased again (70 → 80)
  • Change [Undocumented] Affected by Smart target priority changes from obtaining the Smart Spikes upgrade
Some minor changes to a few upgrades on Spike Factory evening out some aspects of it.
~ Ninja Kiwi
  • BUFF 1-0-5 Permaspike pierce increased from 80 → 90
[...] Permaspike, while admittedly not often utilized to its max potential, has sat in a dominant high end position for a long time so we are shifting it away from such high pierce into more damage per pierce.
~ Ninja Kiwi
  • NERF 0-x-5 Permaspike pierce reduced 50 → 25
  • NERF 1-0-5 Permaspike pierce reduced 90 → 45
  • BUFF Permaspike damage increased 10 → 15
[...] Finally, we enjoyed the hard hitting nerf to Permaspike’s early game, but admittedly this change didn’t really change much of anything for its endgame power while impacting pre r80 rounds far more, so we’re redoing the nerf into a pure attack speed nerf along with an increased benefit to the start of round rate buff to reduce the necessity in playing slowly with it
~ Ninja Kiwi
  • BUFF Base Perma-Spike pierce increased 25 → 50
  • BUFF 1-0-5 Perma-Spike pierce increased 45 → 90
  • NERF Perma-Spike damage decreased (15 → 10)
  • NERF x-0-5 Permaspike attack rate reduced 4.85s → 6.0625s
    • NERF 0-1-5: 3.38s → 4.85s
    • NERF 0-2-5: 2.72s → 3.40s
  • BUFF Perma-Spike's start-of-round attack speed duration increased (2.5s → 10s)

Bug Fixes and General Changes[]

  • Change Description changed from "Spikes become almost permanent." to "High damage spikes become almost permanent."
    • Undocumented in Patch Notes.

Extra Notes (Version History)[]


Official artwork[]




  • Contrary to popular belief, the Perma-Spike does not have a cap on the number of spikes, or a spike pile limit. The only limit is from the spikes decaying.
  • Between Version 2.0 and 11.2, a 0-2-5 can achieve a spike pile that can store around 65,000 pops worth of spikes if allowed to create a full stack.
  • Contrary to popular belief, x-0-5 Permaspike did not have the same attack speed as x-0-4 Deadly Spikes in v1.0 at the game's launch. The attack cooldown actually dropped from 2.2 seconds to 3.0 seconds, later to be nerfed to the current value of 6.0 seconds.
    • Interestingly enough, before Overclock became nerfed in Version 14.0, activating the Overclock ability onto a Perma-Spike would cause the Perma-Spike to attack at the same rate as before the pre-2.0 nerf, as the former +100% attack speed bonus balances out the halved attack speed nerf to Perma-Spike.
  • Although Permaspike was not specifically stated to be buffed, it got indirectly buffed by the Deadly Spikes round lifespan buff by +1 round.
  • Prior to the Overclock reworks, a 0-2-5 Perma-Spike where the 0-2-3 Spike Factory portion was discounted by two Monkey Commerce villages would allow Overclock to last 45 seconds instead of 30 seconds. This strategy was used popularly by other players on CHIMPS, but this no longer works as of Version 21.0 and later because of the reworks.
  • The Version 23.0 Spike Factory attack speed overhaul has improved Path 1 crosspathing while retaining viability for 0-2-5. So overall, this is a buff to the opposite crosspath. Similar occurs for Super Mines.
    • Ninja Kiwi addressed that Permaspike was bugged to not inherit the base Spike Factory speed buff, so it did not actually attack every 4.77s without Path 2 crosspaths. In that case, it nerfed the 0-2-5 unexpectedly. This was fixed on Version 23.2, but to 4.85s instead of what calculationally should be 4.77s, although this was likely to balance out the 0-2-5 attack speed back to what it was formerly.
      • Mathematically, 0-1-5 should have received an attack cooldown of 3.82s, and for 0-2-5 it should have been 2.67s.
      • So technically speaking, the 0-2-5 crosspath is still overall nerfed, albeit just by 0.02s, which generally speaking makes little difference to its overall stockpiling power.
      • If the 0-2-5 Perma-Spike attack speed was the basis for the Perma-Spike's attack cooldown, where 0-2-5 would be kept as 2.7s, 0-1-5 would have an attack cooldown of 3.86s, and x-0-5 would be 4.82s. The above theoretical calculation is for the basis of buffing the non-Path-2 Perma-Spike based off the general Spike Factory attack speed buff.
  • The pierce of the 1-0-5 Perma-Spike crosspath has been buffed for a total of 3 times, and it always received +10 pierce on each update it was buffed. The pierce buffs, however, were changed drastically in 36.0 (but reverted in 38.0) due to the base Perma-Spike pierce nerfs, although the proportional pierce increase remains similar.