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

This Sudoku Puzzle has 45 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple, Skyscraper, Uniqueness Test 3, Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 7 → 8 (Naked Single)
  2. Row 8 / Column 8 → 3 (Naked Single)
  3. Row 3 / Column 7 → 4 (Naked Single)
  4. Row 4 / Column 1 → 2 (Naked Single)
  5. Row 6 / Column 8 → 6 (Naked Single)
  6. Row 7 / Column 7 → 9 (Naked Single)
  7. Row 5 / Column 7 → 5 (Full House)
  8. Row 4 / Column 9 → 7 (Naked Single)
  9. Row 5 / Column 9 → 4 (Full House)
  10. Row 6 / Column 5 → 4 (Naked Single)
  11. Row 4 / Column 5 → 6 (Naked Single)
  12. Row 4 / Column 2 → 1 (Full House)
  13. Row 9 / Column 5 → 3 (Naked Single)
  14. Row 7 / Column 5 → 7 (Naked Single)
  15. Row 6 / Column 1 → 5 (Hidden Single)
  16. Row 5 / Column 6 → 7 (Hidden Single)
  17. Row 5 / Column 4 → 9 (Hidden Single)
  18. Row 8 / Column 6 → 9 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 8 in b9 => r123c9<>8
  20. Row 3 / Column 9 → 6 (Naked Single)
  21. Locked Candidates Type 2 (Claiming): 8 in c1 => r1c23,r2c23,r3c2<>8
  22. Naked Pair: 4,8 in r2c16 => r2c2<>4, r2c8<>8
  23. Row 2 / Column 8 → 2 (Naked Single)
  24. Row 1 / Column 8 → 8 (Full House)
  25. Naked Triple: 3,5,6 in r12c3,r2c2 => r1c2<>3, r1c2<>5
  26. Skyscraper: 4 in r1c4,r9c6 (connected by r19c2) => r2c6,r8c4<>4
  27. Row 2 / Column 6 → 8 (Naked Single)
  28. Row 8 / Column 4 → 1 (Naked Single)
  29. Row 9 / Column 6 → 4 (Full House)
  30. Row 6 / Column 6 → 1 (Full House)
  31. Row 6 / Column 4 → 8 (Full House)
  32. Row 2 / Column 1 → 4 (Naked Single)
  33. Row 3 / Column 4 → 2 (Naked Single)
  34. Row 1 / Column 4 → 4 (Full House)
  35. Row 8 / Column 9 → 5 (Naked Single)
  36. Row 1 / Column 2 → 2 (Naked Single)
  37. Row 8 / Column 1 → 7 (Naked Single)
  38. Row 3 / Column 1 → 8 (Full House)
  39. Row 3 / Column 2 → 7 (Full House)
  40. Row 8 / Column 2 → 4 (Full House)
  41. Uniqueness Test 3: 1/8 in r7c39,r9c39 => r2c3<>3, r2c3<>5
  42. Row 2 / Column 3 → 6 (Naked Single)
  43. Row 5 / Column 3 → 8 (Naked Single)
  44. Row 5 / Column 2 → 6 (Full House)
  45. Give Up: Don't know how to proceed!
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