Unwrapping the festive sudoku: A Critical Line puzzle

Person dressed as an elf in green outfit and hat looks surprised while holding a phone and sitting at a laptop, surrounded by festive decorations, wrapped gifts and Christmas ornaments - capturing the moment of discovering the hidden sudoku puzzle solution.

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Happy new year puzzlers!

I hope you had a delightful festive season full of joy, excitement and maybe a bit of head-scratching as you pondered over December’s Critical Line puzzle. Thank you to all 23 puzzlers who sent in their attempt! Without further ado, it is time to reveal the solution to the suspiciously empty sudoku.

The solution

The tricky elves hid the sudoku puzzle in the ‘Christmas tune’ included at the top of the puzzle.

No musical training was needed - each note converts to a number based on its pitch (its height on the sheet music) with rests representing blanks. From there, it’s a matter of filling in the grid like any normal sudoku. Here is the completed sudoku puzzle with black numbers converted from the music and blue numbers solved afterwards:

Completed 9x9 sudoku grid with festive red border and green dividing lines. Black numbers show the initial clues converted from musical notes, while blue numbers show the solved entries.

The completed sudoku puzzle with black numbers converted from the music and blue numbers solved afterwards.

The nice list

Congratulations to the first 10 successful solvers:

  • Andrew Zheng
  • Ada Wong
  • Kalley Chong
  • Sinchana Gaddi
  • Larry Uy
  • Weixuan Li
  • Noah Gribble
  • Allan Zhang
  • Willamson Mai
  • Dana Chen

As a belated gift, Ada Wong was randomly selected from these first 10 solutions and has won the prize of a $100 voucher from the Actuaries Institute!

Critical Line
About the authors
Headshot of James Lindesay
James Lindesay
James is a consultant at Taylor Fry, applying his skills in a wide range of spaces spanning analytics, insurance and research. In his spare time, you'll find him working his way through a long list of daily puzzles, scheming over any board game he can get his hands on or doing laps at the pool.

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