How does the wonder leveling system in Allied Cultures work?

In the Weekly Culture City, you can fillcrates with specific Culture City refined resources to upgrade the current Wonder.


Once all crates for the current level are filled, your Wonder upgrade will start automatically. 

Tip: Use the “Fill All Boxes!” button to automatically allocate your available resources.

Don’t forget to tap the Wonder to finish the upgrade. Once completed, the Wonder’s bonus will improve, and you can claim the reward for unlocking this level.


All unlocked but unclaimed rewards will be collected automatically after the current Allied Culture event ends.

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• If I buy a premium expansion in the weekly Allied Culture event, will it be available next time?
• How can I play the weekly Allied Culture City events?
• How do event rankings and event leaderboards work?