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

This Sudoku Puzzle has 53 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Locked Pair, Uniqueness Test 1, Give Up techniques.

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

Solution Steps:

  1. Row 1 / Column 8 → 8 (Hidden Single)
  2. Row 4 / Column 7 → 8 (Hidden Single)
  3. Row 2 / Column 1 → 4 (Hidden Single)
  4. Row 4 / Column 3 → 4 (Hidden Single)
  5. Row 8 / Column 1 → 6 (Hidden Single)
  6. Row 9 / Column 7 → 6 (Hidden Single)
  7. Row 8 / Column 6 → 8 (Hidden Single)
  8. Row 7 / Column 5 → 4 (Hidden Single)
  9. Row 1 / Column 4 → 4 (Hidden Single)
  10. Row 5 / Column 9 → 4 (Hidden Single)
  11. Row 5 / Column 2 → 6 (Hidden Single)
  12. Row 7 / Column 7 → 9 (Hidden Single)
  13. Row 7 / Column 6 → 2 (Naked Single)
  14. Row 5 / Column 6 → 7 (Naked Single)
  15. Row 8 / Column 4 → 9 (Naked Single)
  16. Row 9 / Column 4 → 5 (Naked Single)
  17. Row 9 / Column 5 → 3 (Full House)
  18. Row 5 / Column 1 → 3 (Hidden Single)
  19. Row 2 / Column 6 → 9 (Hidden Single)
  20. Row 7 / Column 8 → 7 (Hidden Single)
  21. Row 7 / Column 2 → 3 (Naked Single)
  22. Row 7 / Column 3 → 1 (Full House)
  23. Row 9 / Column 9 → 2 (Naked Single)
  24. Row 8 / Column 3 → 2 (Naked Single)
  25. Locked Candidates Type 1 (Pointing): 1 in b5 => r6c9<>1
  26. Locked Candidates Type 1 (Pointing): 5 in b6 => r2c9<>5
  27. Skyscraper: 2 in r1c2,r4c1 (connected by r14c5) => r3c1,r6c2<>2
  28. Row 4 / Column 1 → 2 (Hidden Single)
  29. Row 4 / Column 9 → 7 (Hidden Single)
  30. Row 6 / Column 9 → 5 (Naked Single)
  31. Locked Pair: 7,9 in r3c13 => r2c2,r3c4<>7
  32. Row 2 / Column 4 → 7 (Hidden Single)
  33. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c8<>1
  34. Uniqueness Test 1: 5/6 in r1c56,r4c56 => r1c5<>5, r1c5<>6
  35. Row 1 / Column 5 → 2 (Naked Single)
  36. Row 1 / Column 2 → 5 (Naked Single)
  37. Row 1 / Column 6 → 6 (Full House)
  38. Row 4 / Column 6 → 5 (Full House)
  39. Row 4 / Column 5 → 6 (Full House)
  40. Row 3 / Column 4 → 1 (Naked Single)
  41. Row 3 / Column 5 → 5 (Full House)
  42. Row 6 / Column 5 → 1 (Full House)
  43. Row 6 / Column 4 → 2 (Full House)
  44. Row 2 / Column 2 → 2 (Naked Single)
  45. Row 3 / Column 8 → 2 (Naked Single)
  46. Row 2 / Column 7 → 1 (Naked Single)
  47. Row 5 / Column 7 → 2 (Full House)
  48. Row 5 / Column 8 → 1 (Full House)
  49. Row 2 / Column 9 → 3 (Naked Single)
  50. Row 2 / Column 8 → 5 (Full House)
  51. Row 8 / Column 8 → 3 (Full House)
  52. Row 8 / Column 9 → 1 (Full House)
  53. Give Up: Don't know how to proceed!
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