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- Solve each of the six Sudoku puzzles by filling in the empty cells so that every row, column, and 3x3 subgrid contains the digits 1 through 9 exactly once.
- Use logical deduction: for each empty cell, determine which numbers are already present in its row, column, and 3x3 box; the missing number(s) must be placed there.
- Start with cells that have only one possible candidate (naked singles), then proceed to more complex techniques like hidden singles or pairs if needed.
- Verify each completed puzzle by checking that all rows, columns, and 3x3 boxes contain digits 1–9 without repetition.
- The solutions are unique and can be found through systematic elimination and placement based on standard Sudoku rules.