Medium Sudoku Online

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Medium Sudoku is a good middle ground when you want more resistance than an easy grid but still expect progress from solid fundamentals.

Medium Sudoku strategy

  • Track candidates carefully. When direct placements dry up, note the remaining legal numbers in stubborn cells.
  • Re-scan after every placement. Medium boards often unlock in clusters once a single constraint changes.
  • Look for hidden singles. A number may fit only one spot in a row, column, or box even when several cells stay open.