Tower Placement Rules
In the simplest and most basic terms, towers other than Service Towers can only be built in Land Control Areas, and placing a Control Tower in that area is required before placing Land Control Towers.
You build a tower by right clicking on the tower icon. A Service tower will be built immediately, but right-clicking other tower items (or the Shield Neutralizer item), will result in a reactive menu that tells you what conditions must apply before you can use them. These conditions are based on the core tower-building rules.
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/help towers