Sudoku puzzle for advanced players with a difficulty level of 6,397.

Access the print version by clicking here.
Ensure that each row, column, and 3×3 box in the grid contains the numbers 1 to 9.
Purchase the following issue of the Guardian to view the finished puzzle if it was published from Monday to Thursday, or get Monday’s edition if the puzzle was published on Fridays. Solutions for Saturday puzzles will be provided in the same day’s issue.

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