9
1
8
7
4
2
9
5
2
4
3
1
6
7
5
6
8
5
6
8
4
9
1

This Sudoku Puzzle has 48 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Triple, Full House, Remote Pair, Skyscraper, Uniqueness Test 1, Give Up techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 6 → 9 (Naked Single)
  2. Row 6 / Column 4 → 5 (Hidden Single)
  3. Locked Pair: 4,8 in r4c45 => r4c7,r5c45<>4, r4c7,r5c45<>8
  4. Locked Triple: 1,3,7 in r456c1 => r239c1,r6c2<>3, r239c1,r5c23,r6c2<>7, r5c3<>1
  5. Row 3 / Column 7 → 7 (Hidden Single)
  6. Row 3 / Column 1 → 4 (Hidden Single)
  7. Row 2 / Column 1 → 5 (Naked Single)
  8. Row 9 / Column 1 → 2 (Naked Single)
  9. Row 5 / Column 7 → 4 (Hidden Single)
  10. Row 2 / Column 8 → 4 (Hidden Single)
  11. Row 1 / Column 2 → 2 (Hidden Single)
  12. Row 3 / Column 5 → 5 (Hidden Single)
  13. Row 6 / Column 9 → 2 (Hidden Single)
  14. Row 5 / Column 8 → 8 (Naked Single)
  15. Row 6 / Column 8 → 3 (Naked Single)
  16. Row 1 / Column 8 → 5 (Naked Single)
  17. Row 4 / Column 7 → 1 (Naked Single)
  18. Row 6 / Column 7 → 9 (Full House)
  19. Row 6 / Column 1 → 7 (Naked Single)
  20. Row 4 / Column 1 → 3 (Naked Single)
  21. Row 5 / Column 1 → 1 (Full House)
  22. Row 6 / Column 6 → 6 (Naked Single)
  23. Row 6 / Column 2 → 8 (Full House)
  24. Row 2 / Column 6 → 1 (Naked Single)
  25. Row 3 / Column 6 → 2 (Naked Single)
  26. Row 8 / Column 6 → 7 (Full House)
  27. Row 5 / Column 4 → 2 (Naked Single)
  28. Row 8 / Column 8 → 2 (Naked Single)
  29. Row 7 / Column 8 → 7 (Full House)
  30. Row 5 / Column 5 → 7 (Naked Single)
  31. Row 7 / Column 7 → 8 (Hidden Single)
  32. Row 1 / Column 9 → 1 (Hidden Single)
  33. Row 7 / Column 5 → 2 (Hidden Single)
  34. Row 1 / Column 5 → 8 (Hidden Single)
  35. Row 4 / Column 5 → 4 (Naked Single)
  36. Row 4 / Column 4 → 8 (Full House)
  37. Row 2 / Column 9 → 8 (Hidden Single)
  38. Remote Pair: 3/6 r1c3 -6- r1c7 -3- r3c9 -6- r9c9 => r9c3<>3
  39. Skyscraper: 3 in r2c5,r3c9 (connected by r9c59) => r3c4<>3
  40. Row 3 / Column 4 → 6 (Naked Single)
  41. Row 3 / Column 9 → 3 (Full House)
  42. Row 1 / Column 7 → 6 (Full House)
  43. Row 9 / Column 9 → 6 (Full House)
  44. Row 1 / Column 3 → 3 (Full House)
  45. Uniqueness Test 1: 3/9 in r2c45,r9c45 => r9c4<>3, r9c4<>9
  46. Row 9 / Column 4 → 4 (Naked Single)
  47. Row 8 / Column 2 → 4 (Hidden Single)
  48. Give Up: Don't know how to proceed!
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