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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} − {1,2,3,4,6,7,8,9} = {5}
- Row 5, Column 5
- {1,2,3,4,5,6,7,8,9} − {1,2,3,4,6,7,8,9} = {5}
Check answers after trying
1: 5 3 4 6 7 8 9 1 2 2: 6 7 2 1 9 5 3 4 8 3: 1 9 8 3 4 2 5 6 7 4: 8 5 9 7 6 1 4 2 3 5: 4 2 6 8 5 3 7 9 1 6: 7 1 3 9 2 4 8 5 6 7: 9 6 1 5 3 7 2 8 4 8: 2 8 7 4 1 9 6 3 5 9: 3 4 5 2 8 6 1 7 9
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} − {1,2,3,4,6,7,8,9} = {5} ▸ 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.