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Four Days: World Defense Guide
The area is small and has only one exit. Since the space is limited, you have to carefully devise a diversion path that will force the enemies to reach the exit longer. The enemy air units will be coming in from the southwest at the start of the 8th wave as well so you have to take into consideration the towers you can build along the way. A Reaping tower will be one of your best options here since it can target both air and ground units. Make sure to prioritize upgrading it to max.
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