Progressing through the game reveals challenging puzzles, with the Deltarune Chapter 4 piano sequence standing out as a key obstacle. Solving it grants access to a unique reward. Below, we outline both subtle hints and direct solutions.

Locating the Hidden Golden Piano

During Chapter 4, acquiring the climbing gear (Claimb Claws) allows scaling previously inaccessible terrain. In the Old Man’s library, observe an unusual stack of books differing from static background elements. Climb this structure to discover a gleaming golden instrument.

Deciphering the Musical Clues

Adjacent to the piano, a riddle states:

“Melodies three, there be.
Two in the southern towers
One where gold strikes water.”

This cryptic message indicates three melodic patterns hidden across specific zones accessible via the Old Man’s study:

• First Pattern – Waterfall Area: Located near the Water Cooler boss encounter. From the study’s lower-left exit, proceed leftward to the waterfall room.
  • Input sequence: up, dot, up, left
• Second Pattern – Switch Chamber: Return to the study’s lower-left exit, then head right. Activate the glowing switch to proceed.
  • Input sequence: down, dot, right, dot
• Third Pattern – Waterfall Maze: Behind the piano’s northern path, veer left to navigate a concealed waterfall passage.
  • Input sequence: right, down, left, dot

Combine all sequences at the piano in this order:

• Up, dot, up, left, down, dot, right, dot, right, down, left, dot

Completing the sequence unlocks a hidden chamber behind the Old Man’s desk, triggering a confrontation with the Hammer of Justice. Victory yields the Justice Axe and Shadow Crystal. Defeat the guardian through combat to claim these rewards permanently.