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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Swordfish, undefined, Hidden Rectangle, Continuous Nice Loop, Naked Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 4 → 8 (Hidden Single)
  2. Row 6 / Column 1 → 8 (Hidden Single)
  3. Row 8 / Column 9 → 3 (Hidden Single)
  4. Row 6 / Column 4 → 3 (Hidden Single)
  5. Row 3 / Column 4 → 7 (Naked Single)
  6. Row 2 / Column 4 → 6 (Naked Single)
  7. Row 8 / Column 6 → 8 (Hidden Single)
  8. Row 2 / Column 3 → 3 (Hidden Single)
  9. Row 3 / Column 5 → 3 (Hidden Single)
  10. Row 6 / Column 6 → 6 (Hidden Single)
  11. Row 5 / Column 1 → 3 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c79<>7
  13. Locked Candidates Type 1 (Pointing): 2 in b6 => r5c6<>2
  14. Locked Candidates Type 2 (Claiming): 7 in r6 => r4c8,r5c79<>7
  15. Row 7 / Column 7 → 7 (Hidden Single)
  16. Row 8 / Column 5 → 7 (Hidden Single)
  17. Hidden Pair: 6,7 in r1c13 => r1c1<>2, r1c1<>5, r1c3<>1
  18. Swordfish: 4 r159 c379 => r47c3,r7c9<>4
  19. XYZ-Wing: 1/5/9 in r26c2,r3c3 => r1c2<>1
  20. Hidden Rectangle: 4/9 in r7c48,r8c48 => r7c4<>9
  21. Finned X-Wing: 1 c57 r15 fr3c7 => r1c9<>1
  22. Continuous Nice Loop: 4/5 9= r8c4 =2= r8c2 -2- r1c2 -5- r1c5 -1- r5c5 -9- r4c4 =9= r8c4 =2 => r8c4<>4, r1c79<>5
  23. Row 7 / Column 4 → 4 (Hidden Single)
  24. W-Wing: 1/5 in r2c6,r6c2 connected by 5 in r1c25 => r2c2<>1
  25. Row 3 / Column 3 → 1 (Hidden Single)
  26. X-Wing: 1 c57 r15 => r5c69<>1
  27. Row 5 / Column 6 → 7 (Naked Single)
  28. Naked Pair: 2,4 in r15c9 => r3c9<>2, r9c9<>4
  29. XY-Wing: 2/5/4 in r1c9,r39c7 => r1c7<>4
  30. Row 1 / Column 9 → 4 (Hidden Single)
  31. Row 5 / Column 9 → 2 (Naked Single)
  32. XY-Chain: 9 9- r4c4 -2- r8c4 -9- r8c8 -4- r9c7 -5- r3c7 -2- r1c7 -1- r5c7 -4- r5c3 -9 => r4c123,r5c5<>9
  33. Row 4 / Column 3 → 7 (Naked Single)
  34. Row 5 / Column 5 → 1 (Naked Single)
  35. Row 1 / Column 3 → 6 (Naked Single)
  36. Row 4 / Column 1 → 5 (Naked Single)
  37. Row 1 / Column 5 → 5 (Naked Single)
  38. Row 2 / Column 6 → 1 (Full House)
  39. Row 4 / Column 6 → 2 (Naked Single)
  40. Row 4 / Column 4 → 9 (Full House)
  41. Row 7 / Column 6 → 5 (Full House)
  42. Row 8 / Column 4 → 2 (Full House)
  43. Row 5 / Column 7 → 4 (Naked Single)
  44. Row 5 / Column 3 → 9 (Full House)
  45. Row 1 / Column 1 → 7 (Naked Single)
  46. Row 6 / Column 2 → 1 (Naked Single)
  47. Row 4 / Column 2 → 4 (Full House)
  48. Row 4 / Column 8 → 1 (Full House)
  49. Row 1 / Column 2 → 2 (Naked Single)
  50. Row 1 / Column 7 → 1 (Full House)
  51. Row 9 / Column 7 → 5 (Naked Single)
  52. Row 3 / Column 7 → 2 (Full House)
  53. Row 7 / Column 3 → 8 (Naked Single)
  54. Row 9 / Column 3 → 4 (Full House)
  55. Row 8 / Column 2 → 9 (Naked Single)
  56. Row 2 / Column 2 → 5 (Full House)
  57. Row 3 / Column 1 → 9 (Full House)
  58. Row 8 / Column 8 → 4 (Full House)
  59. Row 3 / Column 9 → 5 (Full House)
  60. Row 7 / Column 8 → 9 (Naked Single)
  61. Row 9 / Column 1 → 6 (Naked Single)
  62. Row 7 / Column 1 → 2 (Full House)
  63. Row 6 / Column 9 → 7 (Naked Single)
  64. Row 6 / Column 8 → 5 (Full House)
  65. Row 2 / Column 8 → 7 (Full House)
  66. Row 2 / Column 9 → 9 (Full House)
  67. Row 7 / Column 5 → 6 (Naked Single)
  68. Row 7 / Column 9 → 1 (Full House)
  69. Row 9 / Column 9 → 8 (Full House)
  70. Row 9 / Column 5 → 9 (Full House)
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