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Sudoku

Objective

  • Fill every cell so each row, column, and box contains each number exactly once.
  • Standard grids use 1–9; mini grids use 1–4.

Controls

  • Select a cell and enter a number.
  • Use Notes mode to record possible numbers.
  • Delete removes the selected cell's entry.

Tools

  • Check highlights incorrect cells.
  • Reveal shows the solution.
  • Clear erases all your entries.

Tips

  • Look for rows, columns, or boxes with only one possible value remaining.