Cost: Easy: $595 | Medium: $710 | Hard: $755
The Spike Factory is a special tower that, once placed, produces Road Spikes that can pop bloons. Each pile can pop 5 bloons, and the spikes disappear if they "time out" or when the round ends. It shoots the spikes on the track, and it will not aim for popping bloons. The Spike Factory was not available at the release of the game, and it was only added in the game in March 15, 2012. It can pop Camo Bloons, even if not upgraded. It is a good idea to place it near the end of the track.
Path 1 UpgradesEdit
Tier 1: Bigger StacksEdit
Cost: $595 (Easy), $700 (Medium), $755 (Hard)
Official Description: Generates larger piles of spikes per shot.
Effect: Generates 10 spikes per shot instead of 5.
Tier 2: White Hot SpikesEdit
Cost: $765 (Easy), $900 (Medium), $970 (Hard)
Official Description: Cuts through lead like a hot spike through... lead.
Effect: Pops lead and frozen bloons.
Tier 3: Spiked Ball FactoryEdit
Cost: $2040 (Easy), $2400 (Medium), $2590 (Hard)
Official Description: Modified to produce heavy but viciously sharp spiked balls instead of regular spikes. Do extra damage to ceramic bloons.
Tier 4: Spiked MinesEdit
Unlocked at: Rank 45
Cost: $11900 (Easy), $14000 (Medium), $15120 (Hard)
Official Description: Rigged with heavy explosives, the spiked balls are set to go off when they lose all their spikes.
Effect: The spiked balls explode when they lose all their spikes. The explosion pops 4 layers of bloons, and they have the same effect of Burny Stuff. Also shoots at a faster rate.
Path 2 UpgradesEdit
Tier 1: Faster ProductionEdit
Cost: $680 (Easy), $800 (Medium), $865 (Hard)
Official Description: Increases the rate of spike production.
Effect: Shoots faster.
Tier 2: Even Faster ProductionEdit
Cost: $1065 (Easy), $1250 (Medium), $1350 (Hard)
Official Description: By adding sprockets, dongles and widgets, the rate of spike production increases even more.
Effect: Shoots even faster.
Tier 3: MOAB-SHREDR SpikesEdit
Cost: $4250 (Easy), $5000 (Medium), $5400 (Hard)
Official Description: Super-Hard-Rending-Engine-Driven-Razors are specially engineered to really hurt MOAB class bloons.
Effect: Each spike does 4 damage to M.O.A.B. Class Bloons. Also shoots at a faster rate.
Tier 4: Spike StormEdit
Unlocked at: Rank 45
Cost: $5525 (Easy), $6500 (Medium), $7020 (Hard)
Official Description: Lays down a thick carpet of spikes over the whole track.
Effect: Adds an ability (Spike Storm) which fills the entire track of spikes. Spikes lasts 5 seconds unless a bloon reaches them, in which the spikes get 5 additional seconds to pop a bloon.
- It is possible to beat the entire game with only Spike Factories, because they can pop Lead Bloons (with White Hot Spikes) and Camo Bloons.
- If used correctly and effectively, it is quite easy to beat up to level 65 relying on Spike Factories, especially with the new and powerful upgrades 3-4 in BTD5.
- If the Spike Factory is placed far enough from the track, it randomly shoots spikes or spiked balls in the border of its search radius. However, the spikes or spiked balls still have an effect if bloons hit them when being blown back.
- There is a glitch where when you buy the Even Faster Production upgrade, it doesn't load the upgraded look unless it is under the range of a Monkey Village.
- If the Spiked Mines "time out", there will be a bloon-popping explosion.
- Spike Factories are very helpful for Covert Pops special mission.
- The Bigger Stacks upgrade is unlike regular Road Spikes because it will pop only 10 bloons instead of 11.
- A 0-0 Spike Factory produces Bigger Stacks when Tack Awesomizer is active.
- A 2-2 Spike Factory upgraded on the second path first looks different then if it is upgraded on the first path first.
- A 1-2 Spike Factory can destroy an entire M.O.A.B., if it is placed near the end of a long track.
- A 1-1 Spike Factory is better than a M.O.A.B. Mauler, unless it is placed too near the beginning of the track.
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