Turrets form most of the defences in the game. What makes this game particularly unique is that they are all player-controlled simultaneously using the mouse. The player must also assign the turrets to factories, and can only control one base's turrets at a time (though only one factory will be attacked in each wave). Furthermore, there is a limit to the number of turrets that can be stationed at each base, which can be upgraded between levels.
- It is important to note that enemies can attack buildings that they are not actively approaching. This is especially important on "Defend The City", Wave 5, where suicide craft can easily destroy Group 2 turrets before reaching Group 1.