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

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

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 6 → 8 (Naked Single)
  2. Row 2 / Column 4 → 7 (Naked Single)
  3. Row 1 / Column 4 → 3 (Naked Single)
  4. Row 2 / Column 2 → 9 (Naked Single)
  5. Row 2 / Column 8 → 6 (Full House)
  6. Row 4 / Column 4 → 5 (Naked Single)
  7. Row 8 / Column 4 → 8 (Naked Single)
  8. Row 6 / Column 4 → 6 (Full House)
  9. Row 3 / Column 1 → 6 (Hidden Single)
  10. Row 7 / Column 5 → 6 (Hidden Single)
  11. Row 9 / Column 8 → 3 (Hidden Single)
  12. Row 3 / Column 7 → 3 (Hidden Single)
  13. Row 5 / Column 7 → 6 (Hidden Single)
  14. Naked Pair: 5,9 in r9c59 => r9c13<>5, r9c137<>9
  15. Row 9 / Column 7 → 1 (Naked Single)
  16. Naked Pair: 4,8 in r39c3 => r1c3<>4, r15c3<>8
  17. Row 1 / Column 3 → 1 (Naked Single)
  18. 2-String Kite: 7 in r3c2,r7c7 (connected by r1c7,r3c9) => r7c2<>7
  19. Continuous Nice Loop: 4/7/8/9 8= r3c2 =7= r3c9 -7- r5c9 =7= r5c5 =8= r5c1 -8- r6c2 =8= r3c2 =7 => r3c2<>4, r17c9<>7, r6c1<>8, r5c5<>9
  20. Locked Candidates Type 2 (Claiming): 4 in c2 => r46c1<>4
  21. Naked Triple: 2,5,9 in r6c178 => r6c56<>2, r6c56<>9
  22. Locked Candidates Type 1 (Pointing): 2 in b5 => r4c8<>2
  23. W-Wing: 4/8 in r3c3,r6c5 connected by 8 in r36c2 => r3c5<>4
  24. W-Wing: 9/5 in r6c1,r8c3 connected by 5 in r68c8 => r5c3,r78c1<>9
  25. XY-Wing: 3/5/9 in r5c36,r6c1 => r5c1<>9
  26. Skyscraper: 9 in r5c6,r9c5 (connected by r59c9) => r4c5,r78c6<>9
  27. Row 9 / Column 5 → 9 (Hidden Single)
  28. Row 9 / Column 9 → 5 (Naked Single)
  29. Row 3 / Column 5 → 5 (Hidden Single)
  30. Row 6 / Column 8 → 5 (Hidden Single)
  31. Row 6 / Column 1 → 9 (Naked Single)
  32. Row 4 / Column 1 → 1 (Naked Single)
  33. Row 6 / Column 7 → 2 (Naked Single)
  34. Row 4 / Column 2 → 4 (Naked Single)
  35. W-Wing: 9/7 in r1c7,r4c8 connected by 7 in r35c9 => r1c8<>9
  36. XY-Chain: 8 8- r3c2 -7- r8c2 -1- r7c2 -3- r6c2 -8- r6c5 -4- r1c5 -2- r3c6 -4- r3c3 -8 => r1c1,r3c9<>8
  37. Row 1 / Column 9 → 8 (Hidden Single)
  38. Row 1 / Column 7 → 9 (Hidden Single)
  39. Row 7 / Column 7 → 7 (Full House)
  40. XY-Wing: 2/5/9 in r7c19,r8c3 => r7c3,r8c8<>9
  41. Row 8 / Column 8 → 2 (Naked Single)
  42. Row 7 / Column 9 → 9 (Full House)
  43. Row 1 / Column 8 → 7 (Naked Single)
  44. Row 3 / Column 9 → 2 (Full House)
  45. Row 5 / Column 9 → 7 (Full House)
  46. Row 4 / Column 8 → 9 (Full House)
  47. Row 1 / Column 1 → 4 (Naked Single)
  48. Row 1 / Column 5 → 2 (Full House)
  49. Row 3 / Column 6 → 4 (Full House)
  50. Row 5 / Column 5 → 8 (Naked Single)
  51. Row 4 / Column 6 → 2 (Naked Single)
  52. Row 4 / Column 5 → 7 (Full House)
  53. Row 6 / Column 5 → 4 (Full House)
  54. Row 3 / Column 3 → 8 (Naked Single)
  55. Row 3 / Column 2 → 7 (Full House)
  56. Row 9 / Column 1 → 8 (Naked Single)
  57. Row 9 / Column 3 → 4 (Full House)
  58. Row 6 / Column 6 → 3 (Naked Single)
  59. Row 5 / Column 6 → 9 (Full House)
  60. Row 6 / Column 2 → 8 (Full House)
  61. Row 5 / Column 1 → 5 (Naked Single)
  62. Row 5 / Column 3 → 3 (Full House)
  63. Row 8 / Column 2 → 1 (Naked Single)
  64. Row 7 / Column 2 → 3 (Full House)
  65. Row 7 / Column 1 → 2 (Naked Single)
  66. Row 8 / Column 1 → 7 (Full House)
  67. Row 7 / Column 3 → 5 (Naked Single)
  68. Row 7 / Column 6 → 1 (Full House)
  69. Row 8 / Column 6 → 5 (Full House)
  70. Row 8 / Column 3 → 9 (Full House)
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