The campaign in Call of Duty: Black Ops 6 introduces players to various intricate safehouse challenges that require sharp observation and problem-solving skills. Among these secrets, the piano room puzzle stands out as an early obstacle that blocks access to a hidden underground bunker. Solving this environmental challenge is essential for anyone aiming to uncover all the rewards hidden throughout The Rook.

Locating the Blacklight in the Safehouse

Before attempting to play any notes on the piano, players must search the room for a key tool. Sitting on a small table near the instrument is a blacklight flashlight that highlights hidden markings scattered around the walls. Picking up this item allows players to spot glowing symbols and numbered arrows that indicate the proper sequence.

Scanning the entire room with the blacklight reveals five specific key markings written alongside directional hints. These notations guide players from one wall to the next in a clear order. Tracking each clue carefully ensures you have the full sequence ready before stepping up to the keyboard.

Understanding the Cyrillic Piano Key Markings

Upon approaching the piano with the blacklight activated, unique markings become visible above each individual key. These symbols correspond to Russian Cyrillic notes rather than standard English musical notation. Matching the clues found on the walls to these key markings is the central mechanic of the puzzle.

The sequence written on the walls follows a numbered progression from one to five. Players must identify each symbol in order to correctly input the melody. Entering an incorrect note simply requires restarting the sequence from the beginning.

The Key Sequence and Unlocking the Secret Basement

To successfully solve the puzzle, interact with the piano and activate your blacklight to view the keys clearly. Press the keys marked with the Cyrillic notes Mn, Pe, Cn, Ao, and Pe in exact order. On standard key order setups, this corresponds to pressing keys five, four, two, three, and four.

Once the final note is played correctly, a secret door built into the wall beside the piano automatically opens. This passage leads down into a basement filled with additional safehouse puzzles and valuable campaign rewards. Completing these follow-up challenges eventually provides access to hidden cash and unique weapon blueprints.