Drusus' Riddle is a Hidden Exploration Objective that you can unlock by interacting with the bulletin board in Sumeru City's Adventurer's Guild. You must follow the clues in each riddle until they eventually lead you to Drusus, the Akademiya researcher who loves making riddles. This puzzle is also the prerequisite to a World Quest called Treasure of Wisdom: A New Plan.
How to unlock Drusus Riddle Hidden Exploration Objective in Genshin Impact
To unlock this puzzle, you must first complete the following prerequisites:
- Archon Quest Chapter III: Act I - Through Mists of Smoke and Forests Dark
- Archon Quest Chapter III: Act II - The Morn a Thousand Roses Bring
Once they're done, head to the Sumeru City Adventurer's Guild in Treasures Street, located in front of Katheryne. Investigate the bulletin board to prompt dialogue with the Branch Master, Kamal, who will tell you about a series of riddles by Drusus. This officially begins the search for the riddles scattered all over the city.
Related: Genshin Impact Static Views Sumeru World Quest guide
How to solve the Drusus Riddle Sumeru City bulletin board puzzle in Genshin Impact
First Riddle Note
After interacting with the bulletin board, head to the southwestern part of Sumeru City, where you'll find a small box hidden in the water under the bridge. Swim to the box and Investigate it to obtain the first Riddle Note.
Second Riddle Note
Based on the clue from the first Riddle Note, head to the Grand Bazaar through the tunnel near the Blacksmith. Reference the image above to help you find your way. Once inside, turn left to immediately spot a fountain.
The second Riddle Note is located inside the fountain. When you step foot inside, face the street and turn left to find a small box—Investigate it to obtain the Quest Item.
Related: How to unlock the hidden Teleport Waypoint under Chatrakam Cave in Sumeru in Genshin Impact
Third Riddle Note
The third Riddle Note is located inside the House of Daena. Start by heading to The Akademiya, which you can find by referencing the mini-map above, still within Sumeru City. Upon entering, keep going forward until you reach the end of the room with two guards. Interact with the door to The Akademiya's library, the House of Daena.
Once inside, go down the stairs and under the bridge, where you'll find an Exquisite Chest (facing the side of the entrance). Interact with the Chest to obtain the third Riddle Note. Keep in mind that this Chest will not grant you Dendro Sigils and does not count toward the Sumeru Chest collection Achievements.
Fourth Riddle Note
You can find the fourth Riddle Note on a pond in the western part of Sumeru City—its exact location is circled in the image above. Investigate the box in the water to obtain the Quest Item.
Fifth Riddle Note
Head to the Sanctuary of Surasthana on the westmost part of Sumeru City (circled in the image above) and change the in-game time to 12:00. An NPC named Drusus will spawn by the balcony. Interact with him to complete this Hidden Exploration Objective. You'll also unlock the Wonders of the World Achievement called "I've Got it! I've Got it!".
Check out our Genshin Impact A Short Encounter with a Rare Bird hidden World Quest guide and Genshin Impact Where Are the Fierce Creatures? hidden World Quest guide to complete more hidden objectives in Sumeru.
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