The next island will be available when you complete all the quests on the current island. Follow the game hints you find in your quests. There are seven islands available in the Athlantean Relic adventure. If you reach the last island in the adventure and see "To be continued", know that you have explored all the available content in this adventure. Note that when you move to the next island, the previous one will be locked within 24 hours, and you will no longer be able to visit it.