Classic Sudoku · 32
Classic Sudoku · 32: a 9×9 Sudoku with 36 clues and one solution. Play online, use pencil notes and hints, or compare the complete answer.
Use rows and columns: R1C1 is row 1, column 1. Enter digits inside the squares.
Read the position, one decision at a time
Follow the deductions in order. Each step uses the grid after the preceding entry.
Reveal step-by-step explanations
Deduction 1: R2C5 = 1
After the preceding deductions, row 2, column 5 has only candidate 1. Its row, column and box exclude every other digit. Enter 1, then update the remaining candidates; this conclusion does not require consulting the completed answer.
Check the existing digits: row 2: 3, 7, 8; column 5: 2, 3, 4, 5, 6, 8, 9; box: 3, 4, 5, 7. Each digit already present rules out that candidate in this cell.
Deduction 2: R5C8 = 3
After the preceding deductions, row 5, column 8 has only candidate 3. Its row, column and box exclude every other digit. Enter 3, then update the remaining candidates; this conclusion does not require consulting the completed answer.
Check the existing digits: row 5: 1, 4, 5, 6; column 8: 2, 7, 8, 9; box: 1, 2, 8. Each digit already present rules out that candidate in this cell.
Deduction 3: R7C7 = 3
After the preceding deductions, row 7, column 7 has only candidate 3. Its row, column and box exclude every other digit. Enter 3, then update the remaining candidates; this conclusion does not require consulting the completed answer.
Check the existing digits: row 7: 2, 5, 6, 7, 8, 9; column 7: 1, 7; box: 1, 4, 5, 7, 8, 9. Each digit already present rules out that candidate in this cell.
Deduction 4: R8C5 = 7
After the preceding deductions, row 8, column 5 has only candidate 7. Its row, column and box exclude every other digit. Enter 7, then update the remaining candidates; this conclusion does not require consulting the completed answer.
Check the existing digits: row 8: 1, 3, 5, 8, 9; column 5: 1, 2, 3, 4, 5, 6, 8, 9; box: 6, 8, 9. Each digit already present rules out that candidate in this cell.
Understand this position
9×9 grid · 3×3 boxes · 36 clues · 45 empty cells
Start by inspecting row 2, column 5. From the starting grid, its legal candidates are 1. Check the filled digits in that row, column and box before entering a number. Only one candidate remains: this is a naked single.
Read the complete answer by row
7 · 6 · 1 · 3 · 5 · 9 · 8 · 4 · 28 · 2 · 4 · 6 · 1 · 7 · 9 · 5 · 39 · 3 · 5 · 2 · 4 · 8 · 7 · 1 · 64 · 7 · 6 · 9 · 3 · 1 · 5 · 2 · 85 · 8 · 2 · 7 · 6 · 4 · 1 · 3 · 91 · 9 · 3 · 8 · 2 · 5 · 4 · 6 · 72 · 4 · 7 · 1 · 9 · 6 · 3 · 8 · 53 · 5 · 8 · 4 · 7 · 2 · 6 · 9 · 16 · 1 · 9 · 5 · 8 · 3 · 2 · 7 · 4