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

Perma-Spike (sometimes referred to as Permaspike) is the 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 4.85s, 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.

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



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 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 spikes 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 4.85s 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 has the benefits of Smart Spikes.

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.


Tower Prices[]

Updated as of Version 29.4
Easy Medium Hard Impoppable
Upgrade Cost (x-x-5) $25,500 $30,000 $32,400 $36,000
Total Cost (0-0-5) $TBA $36,450 $TBA $TBA
Total Cost (1-0-5) $TBA $TBA $TBA $TBA
Total Cost (2-0-5) $TBA $37,850 $40,875 $TBA
Total Cost (0-1-5) $TBA $TBA $TBA $TBA
Total Cost (0-2-5) $TBA $37,850 $40,875 $TBA


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 almost all maps.

Perma-Spike relies heavily on stockpiling its spikes effectively through various means of stalling.

For greater in-depth information about optimization of Perma-Spike and its synergies, refer to Perma-Spike/Strategies.


  • Perma-Spike is very effective on single-exit maps when placed near the end of the bloon track. Then, spikes won't 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 4.85s, 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 although not required.
    • If needed, a Monkey Intelligence Bureau will guarantee all spikes pop lead and can buff other towers in its radius.
  • 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 of using Snowstorm, as Perma-Spike without White Hot Spikes (or using an 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 are 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're likely doomed to lose as reloading for another try will result in the DDTs to eat all of the spikes that were placed earlier and end the game.

Version History[]

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.

  • 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.
  • Change Description changed from "Spikes become almost permanent." to "High damage spikes become almost permanent."
    • Undocumented in Patch Notes.
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 speed increased (3.6s → 4.8s).
  • Nerf [undocumented] 0-2-5 Perma-Spike attack speed 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 speed decreased (4.8s → 3.88s).
  • Buff 0-2-5 Perma-Spike attack speed 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


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 doesn't 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.