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Servant of the Lake Day 3 Walkthrough (Sunday)

Player-documented walkthrough. Rusty Lake does not publish official puzzle solutions, and this page is written from player playthroughs. Treat every step and code as community-reported, verify it in your own game, and confirm storefront or game details on the official pages linked in the sidebar.

Sunday is the climax of the Vanderboom estate weekend. Your duties escalate from domestic chores to preparing alchemical elixirs, organizing the formal family reunion feast, and witnessing the uncanny events of the blood-moon night. Start from Day 2 if you have not reached Sunday yet.

Part 1: Morning Duties and Locating Rusty

Start in the servant quarters: pick up the Fresh Apron and Service Bell from the wardrobe. Go out to the courtyard garden and look behind the hedge maze near the stone fountain to find Rusty the dog chewing on a bone. Offer the Dried Meat (found in the kitchen pantry) to Rusty, then take the Carved Bone Key from his paws.

Part 2: The Alchemical Elixir (Code 2451)

Use the Carved Bone Key on the heavy oak door leading to the private laboratory annex. At the brass-banded alchemical cabinet, enter code 2451 on the rotary dials to disengage the security latches. Place the glass beaker under the copper distillation tube, add Mandragora Root Extract, Lake Water Vial, and Sulfur Powder into the top funnel, light the spirit burner below with matches, and turn the valve to boil the mixture until the fluid turns emerald green. Take the completed Elixir Flask into your inventory.

Part 3: Guest Dressing and Dining Room Setup

Deliver the formal suits and evening dresses to Aldous, Alexandra, and William in their guest chambers. Arrange the dining table: place the dinner plates, silver cutlery, and crystal wine goblets according to the seating card order on the sideboard, light the central candelabras, and ring the Service Bell in the grand hall to summon the family.

Part 4: The Feast and Departure

Serve the courses: Course 1 serves the Herbal Broth to William and Alexandra; Course 2 serves the Roast Game to Aldous. Pour the vintage red wine into every glass, observe the family's toast, and watch through the dining room window as the sky darkens and the moon turns crimson. Deliver the Elixir Flask directly to Aldous.

Part 5: The Climax and Harvey Ending

Watch the cinematic as the elixir takes effect. Collect the fallen feathers from the parlor floor and follow the shadowy silhouettes through the grand doorway into the mist outside. As the credits roll, the servant fully transforms into Harvey, securing flight over the lake as the main weekend story concludes. After the credits, the Kate's Brother hunt is available.

Checklist

Source status

This page is player-documented and not an official guide. The morning duties, elixir recipe, feast service, and Harvey ending are community-reported and have not been cross-checked against a second independent source on this wiki; reported Sunday codes are 2451 (alchemical annex reagent cabinet) and 1643 (cellar pendulum timepiece lock) — see the codes directory. Official store and website links are listed in the sidebar.