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The story of Tsurumi Island does not end with Ruu. After completing The Sun-Wheel and Mt. Kanna, players can unlock a series of hidden exploration objectives, one of which involves solving Shitoki's treasure map puzzle.
To achieve this goal, you need to search for glowing blue conches around Tsurumi Island. Some of them will earn you random items, and others a quest item. While there are plenty of them around the island, there are only four key conches you need to pick up from the locations circled below.
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It is important to start in the area next to the Waverider Waypoint. Picking up the conch will cause an illusion of Shitoki in distress. Shitoki will talk about having left treasure in the conches by his brother, but they were scattered around the island.
Related: Genshin Impact: Waverider Controls, How To Get Out Of The Boat & More
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Each conch will give you a quest item: a treasure map fragment. If you don't receive this item, you must have interacted with the wrong conch, so try searching near the areas circled on the map above.
After collecting all four, head to the cliff near the Statue of Seven, where you'll find an illusion of Shitoki. Speak with him and you will receive the quest item A Treasure Map Left for Shitoki.
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You can open the map in your quest item inventory. It indicates a marked area, located deep within Mount Kanna. That said, head up Mount Kanna and descend the cave. This is the same place where you last saw Ruu.
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There is a Dig interaction next to the Thunderbird statue. Interacting with it will spawn a valuable chest, as well as Big Brother's "letter", which you can read but cannot pick up.
Check out our guide on how to complete the Sun-Wheel and Mt. Kanna world quest in Genshin Impact to complete the quest and unlock this hidden exploration objective.
