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.