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Practice and check
Worked example
Check one empty cell against its row, column, and 3×3 box. Only a candidate allowed by all three may be written.
Row 2, Column 3: {1,2,3,4,5,6,7,8,9} − {1,3,4,5,6,7,8,9} = {2}
- Row 2, Column 3
- {1,2,3,4,5,6,7,8,9} − {1,3,4,5,6,7,8,9} = {2}
Check answers after trying
1: 4 7 9 5 1 6 3 8 2 2: 3 8 2 4 7 9 5 1 6 3: 5 1 6 3 8 2 4 7 9 4: 6 5 1 2 3 8 9 4 7 5: 9 4 7 6 5 1 2 3 8 6: 2 3 8 9 4 7 6 5 1 7: 1 6 5 8 2 3 7 9 4 8: 8 2 3 7 9 4 1 6 5 9: 7 9 4 1 6 5 8 2 3
Printed order
Tips for Parents
▸ What is on the sheet undefined A–C repeat the same blank positions with different digits. A–D are practice-set names, not ranked difficulty. Given cells: 36; Empty cells: 45. ▸ Try one example Row 2, Column 3: {1,2,3,4,5,6,7,8,9} − {1,3,4,5,6,7,8,9} = {2} ▸ Check a difficulty Check one empty cell against its row, column, and 3×3 box. Only a candidate allowed by all three may be written. ▸ Choose the next step Sudoku - 9×9 · Practice Set A / B / C / D. A–C repeat the same blank positions with different digits. A–D are practice-set names, not ranked difficulty.
What This Worksheet Builds
Check one empty cell against its row, column, and 3×3 box. Only a candidate allowed by all three may be written.
Next Step
Sudoku - 9×9 · Practice Set A / B / C / D. A–C repeat the same blank positions with different digits. A–D are practice-set names, not ranked difficulty.