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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Naked Single, Locked Pair, Locked Candidates Type 1 (Pointing), Hidden Pair, undefined, Uniqueness Test 3, Full House techniques.

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

Solution Steps:

  1. Row 4 / Column 3 → 1 (Hidden Single)
  2. Row 1 / Column 1 → 8 (Hidden Single)
  3. Row 7 / Column 5 → 8 (Hidden Single)
  4. Row 6 / Column 3 → 8 (Hidden Single)
  5. Row 6 / Column 8 → 9 (Naked Single)
  6. Row 4 / Column 8 → 8 (Naked Single)
  7. Row 2 / Column 9 → 8 (Hidden Single)
  8. Row 8 / Column 7 → 8 (Hidden Single)
  9. Locked Pair: 5,7 in r6c45 => r4c4,r5c5,r6c2<>7, r5c5<>5
  10. Locked Pair: 6,7 in r4c79 => r4c26,r5c79<>6, r4c2,r5c79<>7
  11. Row 6 / Column 6 → 6 (Hidden Single)
  12. Row 6 / Column 2 → 3 (Naked Single)
  13. Row 4 / Column 2 → 9 (Naked Single)
  14. Row 4 / Column 4 → 4 (Naked Single)
  15. Row 4 / Column 6 → 3 (Naked Single)
  16. Row 5 / Column 5 → 9 (Naked Single)
  17. Locked Candidates Type 1 (Pointing): 5 in b9 => r9c3<>5
  18. Hidden Pair: 1,5 in r1c5,r2c4 => r1c5,r2c4<>7, r2c4<>2, r2c4<>9
  19. Locked Candidates Type 1 (Pointing): 7 in b2 => r3c1379<>7
  20. X-Wing: 4 c68 r28 => r8c13<>4
  21. Uniqueness Test 3: 2/5 in r5c79,r9c79 => r9c3<>4, r9c3<>9
  22. Row 9 / Column 3 → 2 (Naked Single)
  23. Row 7 / Column 2 → 6 (Naked Single)
  24. Row 5 / Column 2 → 7 (Naked Single)
  25. Row 5 / Column 1 → 4 (Naked Single)
  26. Row 5 / Column 3 → 6 (Full House)
  27. Row 8 / Column 2 → 5 (Naked Single)
  28. Row 2 / Column 2 → 2 (Full House)
  29. Row 8 / Column 1 → 7 (Hidden Single)
  30. Row 8 / Column 3 → 9 (Naked Single)
  31. Row 3 / Column 3 → 3 (Naked Single)
  32. Row 9 / Column 1 → 1 (Naked Single)
  33. Row 3 / Column 1 → 9 (Naked Single)
  34. Row 7 / Column 1 → 3 (Full House)
  35. Row 7 / Column 3 → 4 (Full House)
  36. Row 9 / Column 5 → 4 (Naked Single)
  37. Row 3 / Column 5 → 7 (Naked Single)
  38. Row 8 / Column 6 → 2 (Naked Single)
  39. Row 3 / Column 4 → 2 (Naked Single)
  40. Row 6 / Column 5 → 5 (Naked Single)
  41. Row 1 / Column 5 → 1 (Full House)
  42. Row 6 / Column 4 → 7 (Full House)
  43. Row 1 / Column 6 → 9 (Naked Single)
  44. Row 2 / Column 6 → 4 (Full House)
  45. Row 2 / Column 4 → 5 (Full House)
  46. Row 8 / Column 4 → 1 (Naked Single)
  47. Row 7 / Column 4 → 9 (Full House)
  48. Row 8 / Column 8 → 4 (Full House)
  49. Row 3 / Column 7 → 6 (Naked Single)
  50. Row 3 / Column 9 → 4 (Full House)
  51. Row 1 / Column 8 → 2 (Naked Single)
  52. Row 2 / Column 8 → 1 (Full House)
  53. Row 2 / Column 3 → 7 (Naked Single)
  54. Row 1 / Column 3 → 5 (Full House)
  55. Row 2 / Column 7 → 9 (Full House)
  56. Row 7 / Column 9 → 2 (Naked Single)
  57. Row 7 / Column 7 → 1 (Full House)
  58. Row 4 / Column 7 → 7 (Naked Single)
  59. Row 4 / Column 9 → 6 (Full House)
  60. Row 1 / Column 9 → 7 (Naked Single)
  61. Row 1 / Column 7 → 3 (Full House)
  62. Row 9 / Column 7 → 5 (Naked Single)
  63. Row 5 / Column 7 → 2 (Full House)
  64. Row 5 / Column 9 → 5 (Full House)
  65. Row 9 / Column 9 → 9 (Full House)
Show More...