Guardian Sudoku puzzle requires buyers to purchase next issue for solutions
Readers who want the solution to the hard Sudoku published Monday through Thursday must buy the following edition of the Guardian newspaper.

Puzzle rules and grid layout
The puzzle asks players to fill a standard nine by nine grid. Every row, every column and every three by three box must contain the numbers one to nine. The difficulty level for this specific entry is listed as seven thousand four hundred seventy-one hard.
Accessing the completed solution
Solutions for puzzles published on Friday and Saturday appear in either Saturday or Monday editions. To see the answer to the current hard puzzle, readers need to buy the next issue of the Guardian. The newspaper publishes these daily challenges from Monday until Thursday.
Publication schedule details
The publication schedule covers weekdays only and excludes weekend puzzles from the main grid sequence. Specific editions contain answers for the previous days work depending on when the puzzle was released. This arrangement ensures that solutions are available in a separate issue rather than the same day.
Reported by one outlet
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