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

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Naked Pair, Uniqueness Test 1, Hidden Rectangle, Finned Swordfish, Sue de Coq, undefined techniques.

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

Solution Steps:

  1. Row 1 / Column 6 → 5 (Hidden Single)
  2. Row 8 / Column 3 → 5 (Hidden Single)
  3. Row 8 / Column 7 → 6 (Naked Single)
  4. Row 8 / Column 8 → 7 (Naked Single)
  5. Row 8 / Column 2 → 1 (Naked Single)
  6. Row 8 / Column 4 → 4 (Naked Single)
  7. Row 8 / Column 6 → 8 (Full House)
  8. Row 9 / Column 9 → 3 (Naked Single)
  9. Row 7 / Column 8 → 2 (Naked Single)
  10. Row 9 / Column 7 → 5 (Full House)
  11. Row 3 / Column 9 → 8 (Hidden Single)
  12. Row 4 / Column 9 → 4 (Naked Single)
  13. Row 1 / Column 9 → 7 (Full House)
  14. Row 5 / Column 7 → 8 (Hidden Single)
  15. Row 6 / Column 8 → 5 (Hidden Single)
  16. Row 6 / Column 7 → 3 (Hidden Single)
  17. Row 2 / Column 7 → 9 (Naked Single)
  18. Row 1 / Column 7 → 1 (Full House)
  19. Row 3 / Column 3 → 1 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 6 in b5 => r79c6<>6
  21. Naked Pair: 1,9 in r4c58 => r4c16<>1, r4c136<>9
  22. Row 6 / Column 1 → 1 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 4 in b4 => r13c2<>4
  24. Uniqueness Test 1: 1/9 in r4c58,r5c58 => r5c5<>1, r5c5<>9
  25. Hidden Rectangle: 6/8 in r4c13,r7c13 => r7c3<>6
  26. Finned Swordfish: 9 r367 c246 fr7c1 fr7c3 => r9c2<>9
  27. Sue de Coq: r1c123 - {23469} (r1c5 - {49}, r2c3 - {36}) => r2c1<>6, r3c2<>3, r1c8<>4
  28. Naked Pair: 7,9 in r3c24 => r3c6<>7, r3c6<>9
  29. W-Wing: 9/7 in r3c2,r7c6 connected by 7 in r2c16 => r7c2<>9
  30. Sue de Coq: r456c6 - {124679} (r23c6 - {347}, r4c5,r6c4 - {129}) => r79c6<>7
  31. Row 7 / Column 6 → 9 (Naked Single)
  32. Row 9 / Column 1 → 9 (Hidden Single)
  33. X-Wing: 9 r36 c24 => r15c2<>9
  34. 2-String Kite: 7 in r3c4,r7c1 (connected by r2c1,r3c2) => r7c4<>7
  35. Row 7 / Column 4 → 6 (Naked Single)
  36. Row 9 / Column 2 → 6 (Hidden Single)
  37. Row 5 / Column 2 → 4 (Naked Single)
  38. Row 5 / Column 5 → 7 (Naked Single)
  39. Row 9 / Column 5 → 1 (Naked Single)
  40. Row 4 / Column 5 → 9 (Naked Single)
  41. Row 1 / Column 5 → 4 (Full House)
  42. Row 9 / Column 6 → 2 (Naked Single)
  43. Row 9 / Column 4 → 7 (Full House)
  44. Row 4 / Column 8 → 1 (Naked Single)
  45. Row 5 / Column 8 → 9 (Full House)
  46. Row 6 / Column 4 → 2 (Naked Single)
  47. Row 3 / Column 4 → 9 (Full House)
  48. Row 1 / Column 1 → 6 (Naked Single)
  49. Row 3 / Column 6 → 3 (Naked Single)
  50. Row 2 / Column 6 → 7 (Full House)
  51. Row 4 / Column 6 → 6 (Naked Single)
  52. Row 6 / Column 6 → 4 (Naked Single)
  53. Row 6 / Column 2 → 9 (Full House)
  54. Row 5 / Column 6 → 1 (Full House)
  55. Row 5 / Column 3 → 6 (Full House)
  56. Row 3 / Column 2 → 7 (Naked Single)
  57. Row 3 / Column 8 → 4 (Full House)
  58. Row 1 / Column 8 → 3 (Naked Single)
  59. Row 2 / Column 8 → 6 (Full House)
  60. Row 2 / Column 3 → 3 (Naked Single)
  61. Row 2 / Column 1 → 4 (Full House)
  62. Row 4 / Column 1 → 8 (Naked Single)
  63. Row 4 / Column 3 → 2 (Full House)
  64. Row 7 / Column 1 → 7 (Full House)
  65. Row 7 / Column 2 → 3 (Naked Single)
  66. Row 1 / Column 2 → 2 (Full House)
  67. Row 7 / Column 3 → 8 (Full House)
  68. Row 1 / Column 3 → 9 (Full House)
Show More...