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Spiked Mines
Rigged with heavy explosions, the spiked balls are set to go off when they lose all their spikes
File:Spiked Mines.png

Cost: Easy: $11900 | Medium: $14000 | Hard: $15120

Previous Upgrade: Spiked Balls

Next Upgrade: N / A

Appearance Changes: Adds a skull on top of the cover

Spiked Mines is the last upgrade on the first path for the Spike Factory. It produces spikes twice as fast and explode when the spiked mines lose all their spikes, popping 4 layers for each explosion. This tower is highly recommended for popping Ceramic Bloons due to its ability to strip of 3 layers of the ceramic layer at once and its great explosion.