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

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!
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