You can receive VIP points by login to the game everyday. The more consecutive logins you have, the more VIP points rewards you will receive. You can also click [Add Points] button in VIP interface, then you can use gold to buy and use corresponding VIP points to upgrade your VIP level. This is a quicker way to upgrade.
Additionally, you can earn VIP points by finishing tasks and participating in events.
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Game Guide for Clash of Kings