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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.
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.
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. It also has received many changes in both versions of Bloons TD Battles in different ways.
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.
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".