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

This Sudoku Puzzle has 53 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Uniqueness Test 1, undefined, Give Up techniques.

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

Solution Steps:

  1. Row 5 / Column 9 → 3 (Naked Single)
  2. Row 5 / Column 1 → 4 (Full House)
  3. Row 3 / Column 8 → 5 (Naked Single)
  4. Row 4 / Column 4 → 4 (Hidden Single)
  5. Row 1 / Column 1 → 1 (Hidden Single)
  6. Row 2 / Column 4 → 1 (Hidden Single)
  7. Row 9 / Column 9 → 1 (Hidden Single)
  8. Row 7 / Column 2 → 2 (Hidden Single)
  9. Row 4 / Column 6 → 6 (Hidden Single)
  10. Row 6 / Column 1 → 5 (Hidden Single)
  11. Row 7 / Column 9 → 4 (Hidden Single)
  12. Row 8 / Column 9 → 5 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 3 in b5 => r6c23<>3
  14. Row 6 / Column 2 → 9 (Naked Single)
  15. Row 4 / Column 1 → 3 (Naked Single)
  16. Row 9 / Column 2 → 7 (Naked Single)
  17. Row 3 / Column 4 → 3 (Hidden Single)
  18. Row 6 / Column 4 → 7 (Naked Single)
  19. Row 6 / Column 6 → 3 (Full House)
  20. Row 3 / Column 1 → 7 (Hidden Single)
  21. Row 3 / Column 9 → 6 (Full House)
  22. Row 7 / Column 5 → 3 (Hidden Single)
  23. Row 7 / Column 4 → 8 (Hidden Single)
  24. Row 7 / Column 6 → 5 (Hidden Single)
  25. Row 1 / Column 4 → 5 (Hidden Single)
  26. Row 2 / Column 2 → 5 (Hidden Single)
  27. Locked Candidates Type 1 (Pointing): 6 in b1 => r8c3<>6
  28. Locked Candidates Type 1 (Pointing): 9 in b9 => r14c7<>9
  29. Uniqueness Test 1: 3/4 in r1c23,r8c23 => r1c3<>3, r1c3<>4
  30. Row 1 / Column 3 → 6 (Naked Single)
  31. Row 1 / Column 5 → 8 (Naked Single)
  32. Row 2 / Column 5 → 6 (Full House)
  33. Row 2 / Column 3 → 4 (Naked Single)
  34. Row 1 / Column 2 → 3 (Full House)
  35. Row 8 / Column 2 → 4 (Full House)
  36. Row 8 / Column 3 → 3 (Naked Single)
  37. Row 1 / Column 8 → 4 (Hidden Single)
  38. Uniqueness Test 1: 2/8 in r4c39,r6c39 => r4c9<>2, r4c9<>8
  39. W-Wing: 9/7 in r1c6,r4c9 connected by 7 in r2c69 => r1c9<>9
  40. Row 1 / Column 6 → 9 (Hidden Single)
  41. Row 2 / Column 6 → 7 (Full House)
  42. Uniqueness Test 1: 2/7 in r1c79,r4c79 => r4c9<>7
  43. Row 4 / Column 9 → 9 (Naked Single)
  44. Row 2 / Column 9 → 8 (Naked Single)
  45. Row 2 / Column 8 → 9 (Full House)
  46. Row 4 / Column 8 → 8 (Full House)
  47. Row 6 / Column 9 → 2 (Naked Single)
  48. Row 1 / Column 9 → 7 (Full House)
  49. Row 4 / Column 7 → 7 (Full House)
  50. Row 4 / Column 3 → 2 (Full House)
  51. Row 6 / Column 3 → 8 (Full House)
  52. Row 1 / Column 7 → 2 (Full House)
  53. Give Up: Don't know how to proceed!
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