Every 15 seconds the factory generates a storm of short-lived spikes, filling up the whole track.
”
~ Official description
Spike Storm is the final upgrade of the Spike Factory in Bloons TD 4. It causes the Spike Factory to launch hundreds of spike piles across the entire track every ~14.3s. This attack cooldown can be decreased in Bloons TD 4 Mobile through the usage of Jungle Drums, but not in Bloons TD 4 Flash and its Expansion. The number of spikes launched depends on how long the track is, and the spikes last for a random amount of time, between ~2.86s and ~5.71s.
Sometimes, the spike storm only targets some sections of the track instead of all of the track. This bug does not seem to exist in the Mobile version.
It costs $5,950 on Easy, $7,000 on Medium, and $7,560 on Hard.
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Strategy[]
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Spike Storm is an effective way to dish a lot of general damage across the entire track. However, since the spikes have limited pierce, they aren't super effective against very dense groups.
