Casterfell Woods Castle Key Location in Atomfall – Comprehensive Guide on Acquisition and Usage

If you’ve ventured into the eerie Castle Ruins of Casterfell Woods in Atomfall, you may have stumbled upon an intriguing detail: a keyhole situated next to the fireplace in the dining room. This hint suggests the presence of a hidden chamber, yet accessing it requires a specific key, challenging players in their quest.

Unlike many contemporary games, Atomfall does not provide players with hints or markers to indicate the quest or the location of the key. This lack of guidance can lead to frustration when players search for seemingly insignificant items that are crucial for progress.

1. How to Find the Castle Key in Casterfell Woods

Castle Ruins' Map Location in Atomfall — Castle Ruins’ Map Location in Atomfall | Source: In-Game Screenshot

The Castle Key can be found on a countertop in the kitchen of the Castle Ruins, located in the bottom left corner of the Casterfall Woods map.

Castle Ruins Entrance in Atomfall | Source: In-Game Screenshot

To locate the key, enter the ruins through the main entrance, proceed down the second hallway on your left, and then turn right. This route will bring you to the kitchen, where the Castle Key sits atop a countertop next to a flickering candle.

Castle Key's Location in Castle Ruins of Casterfell Woods — Castle Key’s Location in Castle Ruins of Casterfell Woods | Source: In-Game Screenshot

2. How to Use the Castle Key in Atomfall

Keyhole Next to the Fireplace in Dining Room | Source: In-Game Screenshot

After acquiring the Castle Key, exit the kitchen through the second door and continue walking until you reach a spacious dining hall.

Secret Chamber Behind the Fireplace in Castle Ruins | Source: In-Game Screenshot

You will encounter a keyhole adjacent to the fireplace, located behind the imposing stone throne. Insert the key into the keyhole to unlock a secret door concealed within the fireplace, allowing you to advance further in your quest!

3. About Atomfall

Atomfall is a survival-action video game developed and published by Rebellion Developments. Set five years after the infamous 1957 Windscale nuclear disaster, it immerses players in a quarantined Northern England. In the game, players navigate through a creatively reimagined British countryside, engaging in scavenging, crafting, and combat while piecing together an intricate mystery. The gameplay draws inspiration from classic British science fiction, invoking elements reminiscent of “Day of the Triffids” and “Doctor Who.” Since its release on March 27, 2025, Atomfall has become available on platforms including PlayStation 5, Xbox Series X/S, PlayStation 4, Xbox One, and PC via Steam, Epic Games Store, and Microsoft Store.

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