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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Uniqueness Test 1, Hidden Rectangle, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 1 → 6 (Naked Single)
  2. Row 5 / Column 3 → 9 (Hidden Single)
  3. Row 5 / Column 1 → 8 (Hidden Single)
  4. Row 4 / Column 5 → 8 (Hidden Single)
  5. Row 8 / Column 8 → 8 (Hidden Single)
  6. Row 2 / Column 9 → 8 (Hidden Single)
  7. Row 4 / Column 9 → 9 (Hidden Single)
  8. Row 4 / Column 4 → 4 (Hidden Single)
  9. Locked Pair: 3,6 in r7c89 => r7c57,r9c7<>3, r7c5<>6
  10. Row 7 / Column 7 → 2 (Naked Single)
  11. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c5<>5
  12. Locked Candidates Type 1 (Pointing): 2 in b4 => r289c2<>2
  13. Row 2 / Column 3 → 2 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 1 in b9 => r13c7<>1
  15. Locked Candidates Type 1 (Pointing): 7 in b9 => r135c7<>7
  16. Locked Candidates Type 2 (Claiming): 5 in c4 => r5c56,r6c56<>5
  17. Locked Candidates Type 2 (Claiming): 3 in c6 => r5c45,r6c45<>3
  18. Uniqueness Test 1: 2/3 in r4c26,r5c26 => r5c6<>2, r5c6<>3
  19. Row 5 / Column 6 → 1 (Naked Single)
  20. Hidden Rectangle: 5/7 in r5c48,r6c48 => r5c8<>7
  21. XY-Chain: 7 7- r5c9 -3- r5c7 -4- r1c7 -9- r1c6 -5- r8c6 -2- r4c6 -3- r6c6 -9- r6c5 -7 => r5c45,r6c8<>7
  22. Row 5 / Column 9 → 7 (Hidden Single)
  23. XY-Wing: 5/7/3 in r26c4,r6c8 => r2c8<>3
  24. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c5<>3
  25. XYZ-Wing: 2/5/6 in r58c5,r8c6 => r9c5<>2
  26. Row 9 / Column 1 → 2 (Hidden Single)
  27. Hidden Rectangle: 1/5 in r3c12,r8c12 => r3c2<>1
  28. XY-Chain: 6 6- r5c5 -2- r4c6 -3- r6c6 -9- r6c5 -7- r6c4 -5- r6c8 -3- r7c8 -6- r2c8 -7- r2c4 -3- r9c4 -6 => r5c4,r89c5<>6
  29. Row 5 / Column 4 → 5 (Naked Single)
  30. Row 6 / Column 4 → 7 (Naked Single)
  31. Row 2 / Column 4 → 3 (Naked Single)
  32. Row 9 / Column 4 → 6 (Full House)
  33. Row 6 / Column 5 → 9 (Naked Single)
  34. Row 6 / Column 6 → 3 (Naked Single)
  35. Row 6 / Column 8 → 5 (Full House)
  36. Row 4 / Column 6 → 2 (Naked Single)
  37. Row 4 / Column 2 → 3 (Full House)
  38. Row 5 / Column 5 → 6 (Full House)
  39. Row 5 / Column 2 → 2 (Full House)
  40. Row 8 / Column 6 → 5 (Naked Single)
  41. Row 1 / Column 6 → 9 (Full House)
  42. Row 7 / Column 5 → 4 (Naked Single)
  43. Row 8 / Column 1 → 1 (Naked Single)
  44. Row 8 / Column 5 → 2 (Naked Single)
  45. Row 9 / Column 5 → 3 (Full House)
  46. Row 1 / Column 7 → 4 (Naked Single)
  47. Row 7 / Column 1 → 5 (Naked Single)
  48. Row 3 / Column 1 → 4 (Full House)
  49. Row 8 / Column 7 → 7 (Naked Single)
  50. Row 8 / Column 2 → 6 (Full House)
  51. Row 9 / Column 2 → 7 (Naked Single)
  52. Row 9 / Column 3 → 4 (Full House)
  53. Row 9 / Column 7 → 1 (Full House)
  54. Row 5 / Column 7 → 3 (Naked Single)
  55. Row 3 / Column 7 → 9 (Full House)
  56. Row 5 / Column 8 → 4 (Full House)
  57. Row 3 / Column 3 → 7 (Naked Single)
  58. Row 1 / Column 3 → 6 (Full House)
  59. Row 2 / Column 2 → 1 (Naked Single)
  60. Row 3 / Column 2 → 5 (Full House)
  61. Row 3 / Column 5 → 1 (Naked Single)
  62. Row 3 / Column 9 → 3 (Full House)
  63. Row 1 / Column 8 → 7 (Naked Single)
  64. Row 1 / Column 9 → 1 (Naked Single)
  65. Row 7 / Column 9 → 6 (Full House)
  66. Row 1 / Column 5 → 5 (Full House)
  67. Row 2 / Column 5 → 7 (Full House)
  68. Row 2 / Column 8 → 6 (Full House)
  69. Row 7 / Column 8 → 3 (Full House)
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