Tower defense - Wikipedia, the free encyclopedia: "Tower defense is a subgenre of real-time strategy video games.[1][2]
The goal of tower defense games is to try to stop enemies from crossing a map by building towers which shoot at them as they pass. Enemies and towers usually have varied abilities, costs, and ability costs. When an enemy is defeated, the player earns money or points, which are used to buy or upgrade towers, or upgrade the number of money or points that are earned, or even upgrade the rate at which they upgrade.[3]"
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