This level is only playable during clan wars on weekends. You have to be in a clan with at least 2 active people before the weekend starts. Or you can practice it any time if you are a supporter on Patreon

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You have 100 swaps on day 1. The castle is closed every day after that. How long can it survive? Also only 100 gold treasure exists on this level. After that gold treasure won't drop in anymore.