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

This Sudoku Puzzle has 53 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Empty Rectangle, undefined, Uniqueness Test 1, Uniqueness Test 3, Give Up 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 6 / Column 4 → 8 (Naked Single)
  2. Row 6 / Column 5 → 3 (Naked Single)
  3. Row 1 / Column 7 → 9 (Naked Single)
  4. Row 3 / Column 7 → 3 (Naked Single)
  5. Row 7 / Column 7 → 4 (Naked Single)
  6. Row 4 / Column 7 → 8 (Naked Single)
  7. Row 8 / Column 7 → 2 (Full House)
  8. Row 2 / Column 2 → 8 (Hidden Single)
  9. Row 1 / Column 2 → 7 (Hidden Single)
  10. Row 4 / Column 3 → 1 (Hidden Single)
  11. Row 6 / Column 9 → 4 (Hidden Single)
  12. Row 3 / Column 9 → 1 (Hidden Single)
  13. Row 7 / Column 6 → 3 (Hidden Single)
  14. Row 8 / Column 3 → 3 (Hidden Single)
  15. Row 9 / Column 6 → 8 (Hidden Single)
  16. Row 4 / Column 8 → 3 (Hidden Single)
  17. Row 5 / Column 1 → 8 (Hidden Single)
  18. Row 8 / Column 9 → 8 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 4 in b1 => r3c45<>4
  20. Locked Candidates Type 2 (Claiming): 5 in c3 => r3c12<>5
  21. Naked Pair: 5,6 in r2c68 => r2c4<>5, r2c45<>6
  22. Empty Rectangle: 6 in b1 (r5c34) => r3c4<>6
  23. W-Wing: 6/5 in r1c3,r4c1 connected by 5 in r14c9 => r3c1,r5c3<>6
  24. Row 3 / Column 1 → 4 (Naked Single)
  25. Row 5 / Column 3 → 2 (Naked Single)
  26. Row 6 / Column 2 → 5 (Naked Single)
  27. Row 4 / Column 1 → 6 (Full House)
  28. Row 6 / Column 8 → 2 (Full House)
  29. Row 5 / Column 4 → 6 (Hidden Single)
  30. Row 9 / Column 3 → 4 (Hidden Single)
  31. Row 3 / Column 2 → 2 (Hidden Single)
  32. Row 4 / Column 9 → 5 (Hidden Single)
  33. Row 1 / Column 9 → 6 (Naked Single)
  34. Row 1 / Column 3 → 5 (Full House)
  35. Row 2 / Column 8 → 5 (Full House)
  36. Row 3 / Column 3 → 6 (Full House)
  37. Row 2 / Column 6 → 6 (Naked Single)
  38. Row 7 / Column 2 → 6 (Hidden Single)
  39. Naked Pair: 7,9 in r34c5 => r89c5<>7, r89c5<>9
  40. Uniqueness Test 1: 7/9 in r3c56,r4c56 => r3c6<>7, r3c6<>9
  41. Row 3 / Column 6 → 5 (Naked Single)
  42. W-Wing: 9/7 in r3c4,r7c9 connected by 7 in r9c48 => r7c4<>9
  43. Row 7 / Column 9 → 9 (Hidden Single)
  44. Row 5 / Column 9 → 7 (Full House)
  45. Row 5 / Column 8 → 9 (Full House)
  46. Uniqueness Test 1: 5/7 in r7c14,r8c14 => r8c4<>5, r8c4<>7
  47. Row 8 / Column 1 → 5 (Hidden Single)
  48. Row 7 / Column 1 → 7 (Full House)
  49. Row 7 / Column 4 → 5 (Full House)
  50. Uniqueness Test 3: 1/4 in r2c45,r8c45 => r8c2<>9
  51. Row 8 / Column 2 → 1 (Naked Single)
  52. Row 9 / Column 2 → 9 (Full House)
  53. Give Up: Don't know how to proceed!
Show More...