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Automatically generates piles of Road Spikes on the nearby track. Excellent last line of defense.
~ Bloons TD 6 Description

The Spike Factory is a tower that makes its first appearance in an update of Bloons TD 4 on September 8, 2011. It makes a return in an update of Bloons TD 5 Flash on the March 13, 2012 update, and later elsewhere in the rest of the BTD5 generation games. It returns once more since the initial release of Bloons TD 6, on June 13, 2018, and is categorized as a Support Monkey.

The main role of the Spike Factory is to produce spike piles across its range to pop bloons. In this way, many of its upgrades serve in primarily defensive roles. In addition, the Spike Factory can pop camo bloons by default, making it an effective option at countering early-game camo bloons.

Game appearances[]

Spike Factory makes up to 10 appearances:

Bloons TD 4[]

Main article: Spike Factory (BTD4)

In Bloons TD 4, the Spike Factory makes a debut. It was the second new tower to be released in Bloons TD 4, the third being Beekeeper only on Bloons TD 4 Mobile. The Spike Factory automatically generates spikes nearby. Spikes have near infinite duration (999,999 frames)

Bloons TD 5[]

Main article: Spike Factory (BTD5)

The Spike Factory makes a return in Bloons TD 5. It first appeared in a later update of Bloons TD 5 Flash. Spike Factory now has even more upgrade options for increasing its power against specialized bloon types. However, all spikes spewed from Spike Factory now last for a limited amount of time. It also has received many changes in both versions of Bloons TD Battles in different ways. Due to concerns about performance issues from excessive spike piles, the lifetime of spikes are reduced from the Bloons TD 5 game to reduce the maximum amount that can appear at once.

Bloons TD 6[]

Main article: Spike Factory (BTD6)

Initially the only offensive Support Monkey when BTD6 first released, the Spike Factory produces spikes on the bloon track. It was initially released with the release of the game. The core upgrade path structure for the Spike Factory has remained fairly the same when it was first released, with additional upgrades added for even more specialization.

Bloons TD Battles 2[]

Main article: Spike Factory (BTDB2)

Spike Factories make a return in Bloons TD Battles 2. Spikes do not disappear at the end of rounds, similarly to BTD6's Apopalypse and previous games in the Bloons TD Battles subseries.


Tower Costs[]

Game Easy Medium Hard Impoppable
Bloons TD 4 $595 $700 $755 -
Bloons TD 5 Flash $640 $750 $810 -
Bloons TD 5 Mobile $640 $750 $810 $900
Bloons TD Battles Flash $750
Bloons TD Battles Mobile $600
Bloons Monkey City Flash $TBA
Bloons Monkey City Mobile $810
Bloons TD 6 $850 $1,000 $1,080 $1,200



Main article: Spike Factory/Strategies


Spike Factories are tailor made for guarding exits but can be used anywhere. Powerful upgrades include: White Hot Spikes, Spiked Ball Factory, MOAB-SHREDR, Spike Storm.
~ BMC Flash description
Generates piles of road spikes around the track automatically. Leftover spikes disappear at the end of each round.
~ Bloons TD 4 Description
Generates piles of road spikes on bits of nearby track. Each pile can pop 5 bloons, and unused spikes disappear at end of each round.
~ Bloons TD 5 Description


Spike Factory

The Spike Factory is out!

  • In BTD4, sometimes the Spike Storm will only cover 1/4-1/2 of the track, while in BTD5, it covers the whole track, but the spikes disappear faster than in BTD4.
    • However, there was originally a bug where the Spike Storm ability only placed spikes in the Spike Factory's range.
  • The spikes created by the Spike Factory will not be placed on the track if the Spike Factory placed far enough from the track. However, in BTD5 the spikes still have an effect if bloons hit it when being blown back by upgrades such as Distraction.
  • Some players tend to call this tower the "Spactory", which is an abbreviated and shortened version of "Spike Factory".