To maximize your gem earnings in Frozen City, consider implementing the following advanced strategies:

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1. Participate in Special Events

Engage actively in time-limited events such as "Grandpa’s Farm," "Fish Farming," "Turning Waste Into Treasure," and "The Last Autumn." These events offer substantial gem rewards and exclusive items. For instance, the "Turning Waste Into Treasure" event provides opportunities to exchange items for gems and unlock rare heroes.

2. Complete Achievements and Tasks

Focus on completing in-game achievements and tasks, which often reward gems upon completion. Prioritize tasks that align with your gameplay style to efficiently accumulate gems.

3. Watch Advertisements

Take advantage of opportunities to watch short video ads in exchange for gems. This method requires minimal effort and can significantly boost your gem count over time.

4. Open Free Chests Regularly

Visit the in-game shop every 8 hours to claim a free Common Chest, which may contain gems. Additionally, by watching an advertisement, you can open a second Common Chest within the same period, effectively doubling your rewards.

5. Prioritize Resource Management

Efficiently manage your in-game resources to avoid unnecessary gem expenditures. For example, ensure your Furnace is always operational to keep your city warm and prevent resource loss due to survivor illnesses.

6. Engage in Battle Mode

Participate in Battle Mode to earn Wishing Stars, which are essential for upgrading heroes. While this mode primarily rewards Wishing Stars, progressing through battles can indirectly contribute to your gem accumulation by strengthening your heroes and enhancing overall gameplay efficiency.

By integrating these strategies into your gameplay, you can efficiently accumulate gems and enhance your Frozen City experience.