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How does the building upgrade system work in Call of Dragons?
Best answer

CityBuilderMaster•2022-02-15
The building upgrade system allows you to improve your city's structures to enhance resource production, troop training, and defensive capabilities. Upgrade buildings using resources and time.
Other answers

ArchitectGamer77•2022-02-18
Building upgrade system: - Enhances resource production, troop training, and defensive capabilities - Upgrade using resources and time
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