Finding the Blackbridge Grotto Admin Key password requires deciphering a clue in the Servant’s Quarters in Blue Prince.

Blue Prince tests your analytical skills through a wide variety of puzzles. The game leaves a subtle clue in every room, which players should take note of to solve a puzzle in another room—and Blackbridge Grotto is no exception. You can access the Blackbridge Grotto by solving the Library periodic table puzzle and directing power from the Boiler Room.
Inside the Blackbridge Grotto, you will encounter the microchip puzzle and a terminal. Interacting with the terminal prompts you to enter the Admin Key, but where do these passwords come from? This guide reveals the Blackbridge Grotto Admin Key passwords while explaining the clue behind them.
Related: Blue Prince: How To Get The Basement Key
Where To Find Clues for Blackbridge Grotto Admin Key Passwords in Blue Prince

You can find the clue to the Blackbridge Grotto Admin Key at Servant’s Quarters. A note in the room mentions the format for temporary Admin Keys to access the Network Administrator Controls. It states that the format should be the first four letters of the second name, followed by the first initial.
Moreover, the note adds that the first and fifth characters should be capitalized. You will discover the full names— Anne Babbage, Kimberley Thompson, and Randolph Moore— at the Security and Laboratory rooms.
What Are the Blackbridge Grotto Admin Key Passwords in Blue Prince?

By applying the clue format found at the Servant’s Quarters, we can deduce that the Blackbridge Grotto Admin Key passwords are:
- BabbA (Anne Babbage)
- ThomK (Kimberley Thompson)
- MoorR (Randolph Moore)
Entering these Admin Keys allows you to access the Network Administrator Controls. You can find more hints and clues about Mt. Holly by checking the User Database, Network Settings, and Admin Logs.
While navigating through the Admin Logs, you will also learn that there is a special Admin Key that doesn’t fit the regular length format. You can find the clue for this newly created Admin Key through the book called ‘A New Clue,’ purchased from the Bookshop. The special Admin Key is LeeB (Bo Lee).
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