Guardian Sudoku puzzle requires buyers to purchase next issue for solutions
The Guardian has released a medium-difficulty Sudoku puzzle where readers must buy the following Monday through Thursday edition to see the completed grid.

Puzzle difficulty and rules
The current challenge is classified as having a medium difficulty level. Players must fill every row, column, and 3×3 box with numbers from one to nine. To view the finished solution for this specific puzzle, readers need to obtain the next issue of the newspaper.
Solution availability schedule
Solutions for puzzles published on Friday and Saturday appear in either the Saturday or Monday edition. The newspaper provides answers for Monday through Thursday puzzles within the subsequent publication cycle. Buying the next issue is the only way to access the completed grid for today's selection.
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