To protect you game progress from being lost, please bind your account with a Google Play account or a Facebook account.
How to Bind Facebook or Google : Open the game at your device>>Tap your avatar >> Setting >> Account >> Bind Account >> Facebook Bind or Google Bind，and then input your Facebook account and password.
Please note: A Google Play account or a Facebook account can only be bound with one account. So please check whether your Google Play account or Facebook account has already been bound with other games or not before you bind it to your account.
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Game Guide for Clash of Kings