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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 5, Column 5: {1,2,3,4,5,6,7,8,9} − {1,2,3,5,6,7,8,9} = {4}
- Row 5, Column 5
- {1,2,3,4,5,6,7,8,9} − {1,2,3,5,6,7,8,9} = {4}
Check answers after trying
1: 4 9 1 7 2 5 8 3 6 2: 7 2 6 3 8 4 9 1 5 3: 3 8 5 9 1 6 4 7 2 4: 5 4 8 2 7 3 1 6 9 5: 1 6 7 5 4 9 2 8 3 6: 2 3 9 8 6 1 5 4 7 7: 8 7 3 4 9 2 6 5 1 8: 6 5 2 1 3 8 7 9 4 9: 9 1 4 6 5 7 3 2 8
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: 30; Empty cells: 51. ▸ Try one example Row 5, Column 5: {1,2,3,4,5,6,7,8,9} − {1,2,3,5,6,7,8,9} = {4} ▸ 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.