Overview[]
The Spike Factory creates piles of spikes within its range. At first each pile contains 3 spikes but it can be upgraded to have more spikes per pile. Costs $750.
Upgrades[]
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Bigger Pile
Spike pile now pops 12 bloons
$700
 Total cost: $1,450
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Unlock the challenge for this tower by unlocking 5M (Nebula).
Complete the challenge to unlock 3S (Shield Generator). | |
Faster Piling
Produces spikes nearly twice as fast
$1,250
 Total cost: $2,700
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Spike Ball Factory
Does more damage to armored bloons
$2,400
 Total cost: $5,100
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Titanium Spikes
Titanium spikes pop twice as much and last longer
$3,000
 Total cost: $5,700
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Moab Shredr
Does more damage to MOAB class bloons
$3,400
 Total cost: $6,100
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Shield Generator
Shields that block and pop bloons
$3,500
 Total cost: $6,200
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Rank 36  x5Spiked Mines
Mines explode when they run out of spikes
$8,500
 Total cost: $13,600
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Rank 36 x5Planetery Spikes
Big spike pile pops 75 bloons
$7,800
 Total cost: $13,500
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Rank 36 x5Trvlr Spikes
Generates more spikes that home in on MOABs
$7,900
 Total cost: $14,000
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Rank 36 x15Ultra Forcefields
Much stronger forcefields
$11,500
 Total cost: $17,700
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Rank 60 x9Spike Wall
Spike wall blocks thousands of bloons
$10,000
 Total cost: $23,600
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Rank 60 x13Nebula
Creates mini-stars that pop 300 bloons
$25,000
 Total cost: $38,500
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Rank 60 x11Spike Storm
Covers the track in spikes
$13,000
 Total cost: $27,000
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Rank 60 x25Lockdown
Place the entire track on lockdown
$42,000
 Total cost: $59,700
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Total to fully unlock: 88
Tips[]
- Can pop camo by default.
- Can pop lead with all upgrades tier 3 and beyond.
- Can damage HTAs with all upgrades tier 1 and beyond.
- The homing spikes from 4R have infinite range.
- 5M factory deals damage to shielded or static bloons instead of popping them on contact.
- Nebulas regrow over time, as long as they haven't reached their lifespans.
- Stack path upgrades cannot bounce back DDTs, ZOMGs and Trojan Bloons, but can slow down DDTs.
Advantages/Disadvantages[]
Advantages[]
- Can deal with bloons that sneak by your defenses.
- Has powerful abilities.
- Left path is good at taking out MOAB class bloons.
- Stack path gives towers more time to target bloons.
- A single nebula factory can solo a ZOMG.
Disadvantages[]
- Bad against shielded bloons and static bloons.
- VERY expensive at higher tiers.
- Ineffective if placed near the path entrance.
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