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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Pair, undefined, Uniqueness Test 4, Hidden Rectangle, Locked Candidates Type 2 (Claiming), Uniqueness Test 6 techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 3 → 9 (Naked Single)
  2. Row 3 / Column 4 → 9 (Hidden Single)
  3. Row 5 / Column 2 → 1 (Hidden Single)
  4. Row 5 / Column 1 → 3 (Naked Single)
  5. Row 8 / Column 9 → 1 (Hidden Single)
  6. Row 7 / Column 3 → 6 (Hidden Single)
  7. Row 8 / Column 1 → 9 (Hidden Single)
  8. Row 3 / Column 5 → 6 (Hidden Single)
  9. Row 4 / Column 2 → 7 (Hidden Single)
  10. Row 4 / Column 5 → 3 (Naked Single)
  11. Row 9 / Column 5 → 5 (Naked Single)
  12. Row 9 / Column 2 → 2 (Naked Single)
  13. Row 7 / Column 1 → 5 (Naked Single)
  14. Row 6 / Column 1 → 2 (Naked Single)
  15. Row 6 / Column 3 → 5 (Full House)
  16. Row 7 / Column 2 → 8 (Naked Single)
  17. Row 8 / Column 2 → 4 (Full House)
  18. Row 2 / Column 2 → 5 (Full House)
  19. Row 3 / Column 1 → 1 (Hidden Single)
  20. Row 1 / Column 1 → 4 (Full House)
  21. Row 4 / Column 4 → 2 (Hidden Single)
  22. Row 2 / Column 4 → 4 (Hidden Single)
  23. Row 1 / Column 6 → 5 (Hidden Single)
  24. Row 5 / Column 6 → 6 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 2 in b9 => r3c8<>2
  26. Skyscraper: 8 in r2c6,r5c5 (connected by r25c9) => r1c5,r6c6<>8
  27. Row 1 / Column 5 → 1 (Naked Single)
  28. Row 6 / Column 6 → 1 (Naked Single)
  29. Row 7 / Column 4 → 1 (Hidden Single)
  30. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
  31. Naked Pair: 5,6 in r48c7 => r3c7<>5, r9c7<>6
  32. 2-String Kite: 3 in r2c9,r9c4 (connected by r1c4,r2c6) => r9c9<>3
  33. Uniqueness Test 4: 2/8 in r1c39,r3c39 => r13c9<>8
  34. Hidden Rectangle: 3/9 in r6c79,r9c79 => r6c9<>3
  35. Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7<>3
  36. Hidden Rectangle: 3/7 in r6c78,r7c78 => r6c8<>7
  37. XY-Chain: 7 7- r5c8 -4- r3c8 -5- r8c8 -2- r8c6 -8- r2c6 -3- r2c9 -8- r5c9 -7 => r5c5,r6c79<>7
  38. Uniqueness Test 6: 7/8 in r6c45,r8c45 => r6c5,r8c4<>7
  39. Row 6 / Column 4 → 7 (Hidden Single)
  40. Row 8 / Column 5 → 7 (Hidden Single)
  41. XY-Chain: 4 4- r5c8 -7- r5c9 -8- r2c9 -3- r2c6 -8- r1c4 -3- r9c4 -6- r9c9 -9- r6c9 -8- r6c5 -4 => r5c5,r6c78<>4
  42. Row 5 / Column 5 → 8 (Naked Single)
  43. Row 6 / Column 5 → 4 (Full House)
  44. Row 6 / Column 8 → 3 (Naked Single)
  45. Row 5 / Column 9 → 7 (Naked Single)
  46. Row 5 / Column 8 → 4 (Full House)
  47. Row 3 / Column 8 → 5 (Naked Single)
  48. Row 3 / Column 9 → 2 (Naked Single)
  49. Row 8 / Column 8 → 2 (Naked Single)
  50. Row 7 / Column 8 → 7 (Full House)
  51. Row 1 / Column 9 → 3 (Naked Single)
  52. Row 3 / Column 3 → 8 (Naked Single)
  53. Row 1 / Column 3 → 2 (Full House)
  54. Row 3 / Column 7 → 4 (Full House)
  55. Row 8 / Column 6 → 8 (Naked Single)
  56. Row 7 / Column 7 → 3 (Naked Single)
  57. Row 7 / Column 6 → 2 (Full House)
  58. Row 2 / Column 6 → 3 (Full House)
  59. Row 1 / Column 4 → 8 (Full House)
  60. Row 2 / Column 9 → 8 (Full House)
  61. Row 1 / Column 7 → 7 (Full House)
  62. Row 8 / Column 4 → 6 (Naked Single)
  63. Row 8 / Column 7 → 5 (Full House)
  64. Row 9 / Column 4 → 3 (Full House)
  65. Row 9 / Column 7 → 9 (Naked Single)
  66. Row 9 / Column 9 → 6 (Full House)
  67. Row 6 / Column 9 → 9 (Naked Single)
  68. Row 6 / Column 7 → 8 (Full House)
  69. Row 4 / Column 7 → 6 (Full House)
  70. Row 4 / Column 9 → 5 (Full House)
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