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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Naked Single, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 2 → 8 (Hidden Single)
  2. Row 3 / Column 1 → 1 (Hidden Single)
  3. Row 2 / Column 8 → 3 (Hidden Single)
  4. Row 7 / Column 2 → 1 (Hidden Single)
  5. Row 3 / Column 5 → 9 (Hidden Single)
  6. Row 1 / Column 1 → 9 (Hidden Single)
  7. Row 8 / Column 2 → 9 (Hidden Single)
  8. Row 7 / Column 7 → 9 (Hidden Single)
  9. Row 1 / Column 3 → 3 (Hidden Single)
  10. Row 5 / Column 1 → 3 (Hidden Single)
  11. Row 6 / Column 8 → 9 (Hidden Single)
  12. Row 5 / Column 6 → 9 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 4 in b2 => r1c78<>4
  14. Locked Candidates Type 1 (Pointing): 7 in b3 => r1c46<>7
  15. Locked Candidates Type 1 (Pointing): 8 in b8 => r7c9<>8
  16. Locked Candidates Type 2 (Claiming): 2 in c1 => r79c3<>2
  17. Locked Candidates Type 2 (Claiming): 5 in c1 => r7c3<>5
  18. Naked Triple: 4,7,8 in r9c379 => r9c5<>4
  19. X-Wing: 3 r68 c47 => r4c47,r7c4<>3
  20. Naked Triple: 2,5,6 in r4c278 => r4c456<>2, r4c459<>5, r4c569<>6
  21. 2-String Kite: 5 in r2c4,r5c3 (connected by r2c2,r3c3) => r5c4<>5
  22. XYZ-Wing: 2/5/6 in r5c35,r6c6 => r5c4<>2
  23. Row 5 / Column 4 → 1 (Naked Single)
  24. Row 1 / Column 6 → 1 (Hidden Single)
  25. Row 4 / Column 9 → 1 (Hidden Single)
  26. Row 4 / Column 5 → 3 (Hidden Single)
  27. Row 7 / Column 9 → 3 (Hidden Single)
  28. Row 6 / Column 7 → 3 (Hidden Single)
  29. Row 8 / Column 4 → 3 (Hidden Single)
  30. Row 7 / Column 1 → 5 (Hidden Single)
  31. Row 8 / Column 1 → 6 (Naked Single)
  32. Row 9 / Column 1 → 2 (Full House)
  33. Row 9 / Column 5 → 6 (Naked Single)
  34. Row 6 / Column 6 → 6 (Hidden Single)
  35. Row 4 / Column 2 → 6 (Hidden Single)
  36. Locked Candidates Type 2 (Claiming): 2 in r4 => r5c7<>2
  37. Locked Candidates Type 2 (Claiming): 5 in r4 => r5c79<>5
  38. Locked Candidates Type 2 (Claiming): 5 in c9 => r1c78,r3c78<>5
  39. X-Wing: 5 r26 c24 => r1c4<>5
  40. W-Wing: 4/2 in r1c4,r7c5 connected by 2 in r27c6 => r1c5,r7c4<>4
  41. Row 1 / Column 4 → 4 (Hidden Single)
  42. Row 4 / Column 4 → 8 (Naked Single)
  43. Row 4 / Column 6 → 4 (Naked Single)
  44. Row 8 / Column 6 → 7 (Naked Single)
  45. Row 2 / Column 6 → 2 (Naked Single)
  46. Row 7 / Column 6 → 8 (Full House)
  47. Row 7 / Column 4 → 2 (Naked Single)
  48. Row 7 / Column 5 → 4 (Full House)
  49. Row 7 / Column 3 → 7 (Full House)
  50. Row 9 / Column 3 → 4 (Full House)
  51. Row 1 / Column 5 → 5 (Naked Single)
  52. Row 2 / Column 4 → 7 (Full House)
  53. Row 2 / Column 2 → 5 (Full House)
  54. Row 6 / Column 4 → 5 (Full House)
  55. Row 5 / Column 5 → 2 (Full House)
  56. Row 3 / Column 3 → 2 (Full House)
  57. Row 6 / Column 2 → 2 (Full House)
  58. Row 5 / Column 3 → 5 (Full House)
  59. Row 3 / Column 8 → 4 (Naked Single)
  60. Row 3 / Column 7 → 8 (Naked Single)
  61. Row 3 / Column 9 → 5 (Full House)
  62. Row 8 / Column 8 → 5 (Naked Single)
  63. Row 8 / Column 7 → 4 (Full House)
  64. Row 9 / Column 7 → 7 (Naked Single)
  65. Row 9 / Column 9 → 8 (Full House)
  66. Row 4 / Column 8 → 2 (Naked Single)
  67. Row 1 / Column 8 → 7 (Full House)
  68. Row 4 / Column 7 → 5 (Full House)
  69. Row 5 / Column 7 → 6 (Naked Single)
  70. Row 1 / Column 7 → 2 (Full House)
  71. Row 1 / Column 9 → 6 (Full House)
  72. Row 5 / Column 9 → 7 (Full House)
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