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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Full House, Naked Single, Locked Candidates Type 2 (Claiming), Naked Triple, Skyscraper, Empty Rectangle, Uniqueness Test 4, undefined, Swordfish, Naked Pair techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 9 → 4 (Hidden Single)
  2. Row 5 / Column 7 → 6 (Hidden Single)
  3. Row 8 / Column 4 → 4 (Hidden Single)
  4. Row 7 / Column 9 → 1 (Hidden Single)
  5. Row 6 / Column 7 → 1 (Hidden Single)
  6. Row 7 / Column 3 → 4 (Hidden Single)
  7. Row 3 / Column 2 → 4 (Hidden Single)
  8. Row 6 / Column 8 → 3 (Hidden Single)
  9. Row 4 / Column 8 → 2 (Full House)
  10. Row 1 / Column 6 → 4 (Hidden Single)
  11. Row 2 / Column 5 → 3 (Hidden Single)
  12. Row 8 / Column 3 → 3 (Hidden Single)
  13. Row 4 / Column 1 → 3 (Hidden Single)
  14. Row 8 / Column 2 → 1 (Hidden Single)
  15. Row 4 / Column 2 → 5 (Naked Single)
  16. Row 4 / Column 3 → 9 (Hidden Single)
  17. Row 4 / Column 4 → 6 (Naked Single)
  18. Row 4 / Column 6 → 1 (Full House)
  19. Row 6 / Column 4 → 9 (Hidden Single)
  20. Row 3 / Column 5 → 1 (Hidden Single)
  21. Locked Candidates Type 2 (Claiming): 2 in r8 => r7c56,r9c56<>2
  22. Naked Triple: 2,5,7 in r1c379 => r1c15<>2, r1c1<>7, r1c5<>5
  23. Skyscraper: 2 in r5c4,r6c2 (connected by r2c24) => r5c13,r6c6<>2
  24. Row 6 / Column 6 → 7 (Naked Single)
  25. Row 6 / Column 2 → 2 (Full House)
  26. Row 2 / Column 2 → 7 (Full House)
  27. Row 1 / Column 9 → 7 (Hidden Single)
  28. Skyscraper: 2 in r1c3,r7c1 (connected by r17c7) => r23c1,r9c3<>2
  29. Empty Rectangle: 5 in b2 (r27c8) => r7c6<>5
  30. Uniqueness Test 4: 2/3 in r3c79,r9c79 => r39c7<>2
  31. XY-Chain: 5 5- r2c4 -2- r5c4 -5- r5c5 -2- r8c5 -7- r8c8 -8- r2c8 -5 => r2c36<>5
  32. XY-Chain: 9 9- r1c5 -6- r2c6 -2- r8c6 -8- r7c6 -9 => r3c6,r7c5<>9
  33. Row 3 / Column 1 → 9 (Hidden Single)
  34. Row 1 / Column 1 → 6 (Naked Single)
  35. Row 1 / Column 5 → 9 (Naked Single)
  36. Row 7 / Column 6 → 9 (Hidden Single)
  37. Row 9 / Column 5 → 6 (Hidden Single)
  38. Row 2 / Column 6 → 6 (Hidden Single)
  39. Locked Candidates Type 2 (Claiming): 7 in r9 => r7c1<>7
  40. Swordfish: 5 r139 c367 => r7c7<>5
  41. Naked Pair: 2,8 in r7c17 => r7c8<>8
  42. Skyscraper: 8 in r3c3,r7c1 (connected by r37c7) => r2c1,r9c3<>8
  43. Row 2 / Column 1 → 1 (Naked Single)
  44. Row 9 / Column 3 → 7 (Naked Single)
  45. Row 5 / Column 1 → 7 (Naked Single)
  46. Row 5 / Column 3 → 1 (Full House)
  47. W-Wing: 5/2 in r1c3,r3c6 connected by 2 in r2c34 => r3c3<>5
  48. Row 1 / Column 3 → 5 (Hidden Single)
  49. Row 1 / Column 7 → 2 (Full House)
  50. Row 3 / Column 9 → 3 (Naked Single)
  51. Row 9 / Column 9 → 2 (Full House)
  52. Row 7 / Column 7 → 8 (Naked Single)
  53. Row 9 / Column 1 → 8 (Naked Single)
  54. Row 7 / Column 1 → 2 (Full House)
  55. Row 3 / Column 7 → 5 (Naked Single)
  56. Row 2 / Column 8 → 8 (Full House)
  57. Row 9 / Column 7 → 3 (Full House)
  58. Row 9 / Column 6 → 5 (Full House)
  59. Row 8 / Column 8 → 7 (Naked Single)
  60. Row 7 / Column 8 → 5 (Full House)
  61. Row 7 / Column 5 → 7 (Full House)
  62. Row 3 / Column 6 → 2 (Naked Single)
  63. Row 2 / Column 4 → 5 (Full House)
  64. Row 2 / Column 3 → 2 (Full House)
  65. Row 3 / Column 3 → 8 (Full House)
  66. Row 8 / Column 6 → 8 (Full House)
  67. Row 8 / Column 5 → 2 (Full House)
  68. Row 5 / Column 4 → 2 (Full House)
  69. Row 5 / Column 5 → 5 (Full House)
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