It passively dispenses piles of spikes onto the nearby track that damage Bloons on contact. Each pile contains 5 spikes (6 with One More Spike), and each spike deals 1 damage. Each spike pile disappears at the end of the round or after 50 seconds, which allows it to build up a thick layer of spikes over time. It can't damage Lead Bloons or frozen Bloons, which destroy its spike piles without being damaged.
It can be upgraded to dispense explosive spiked mines, MOAB-class-Bloon-shredding spikes with drastically increased attack speed, as well as laying spikes over the whole track, or increasing the duration and damage of the spikes.
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The Spike Factory's basic attack places a pile of spikes onto a random point on the track within its range every 1.75 seconds. It can attack even if there are no Bloons within its range, and it can deploy spikes onto parts of the track that are behind line of sight blockers, but it can't deploy spikes if there is no point on the track within its range. Each pile is a projectile that can re-hit Bloons every frame,[fn 1] and the number of spikes in the pile represents the amount of pierce it has. If its pierce is increased, it displays more spikes in the pile accordingly; it can only visually show up to 20 spikes, but it has no pierce cap. By default, each pile contains 5 spikes (6 with One More Spike) that each deal 1 sharp-typedamage. Spike piles expire on their own at the end of each round (except in Apopalypse mode, Race Events, CT Time Attack, and Boss Rush), after a Boss Bloon spawns, or 50 seconds after being deployed.
Although the Spike Factory's spikes can hit Camo Bloons, its attack is not considered to have Camo detection. This means that the Spike Factory does not allow Advanced Intel to target Camo Bloons in its range, nor does it allow Gerry's Fire to target or hit Camo Bloons if used on it.
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The Spike Factory is best placed at the end of the track, so that it has the most time possible to build up spike piles.
Changes from Bloons TD 5
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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. — Update notes
One More Spike), and each spike deals 1 damage. Each spike pile disappears at the end of the round or after 50 seconds, which allows it to build up a thick layer of spikes over time. It can't damage Lead Bloons or frozen Bloons, which destroy its spike piles without being damaged.
Base projectile lifespan reduced ― 70s → 50s 
Base spike factory rate increased ― 2.2s → 1.75s
Spike Factory Pineapples
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