Board Thread:Questions and Answers/@comment-107.200.18.241-20130813193454/@comment-3153244-20130815110848

107.200.18.241 wrote: They are permanent and go away as they are used to pop bloons, and they go away after each round. I dont understand what this is referring to... thanks. Spike Factory spikes disappear after a while. Spikes R Us increases the time that these spikes will stay before disappearing. Here's my interpretation: let's say spikes from the Spike Factory disappear after 60 seconds. With the Specialty Building, they will disappear after 66 seconds instead.