What is the Tesla Tower and how do I use it?

Every campaign level starts with 3 charges in your Tesla Tower, once these three charges are used you can get 3 more charges using Gems.

In order to use a Tesla Tower, all you need to do is tap on it, and drag your finger towards the enemies you are looking to eliminate. The cross-hair displayed underneath your finger will change colour from red too blue once it is ready to fire. 

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