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

This Sudoku Puzzle has 35 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Uniqueness Test 6, Hidden Rectangle, Discontinuous Nice Loop, Give Up techniques.

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

Solution Steps:

  1. Row 4 / Column 8 → 2 (Naked Single)
  2. Row 5 / Column 8 → 5 (Naked Single)
  3. Row 2 / Column 8 → 8 (Naked Single)
  4. Row 1 / Column 8 → 3 (Naked Single)
  5. Row 8 / Column 8 → 4 (Full House)
  6. Row 4 / Column 9 → 7 (Hidden Single)
  7. Row 4 / Column 3 → 9 (Naked Single)
  8. Row 7 / Column 3 → 4 (Hidden Single)
  9. Row 9 / Column 6 → 6 (Hidden Single)
  10. Row 7 / Column 1 → 7 (Hidden Single)
  11. Row 5 / Column 3 → 7 (Hidden Single)
  12. Row 9 / Column 7 → 8 (Hidden Single)
  13. Row 4 / Column 6 → 8 (Hidden Single)
  14. Row 4 / Column 4 → 6 (Naked Single)
  15. Row 4 / Column 5 → 4 (Full House)
  16. Row 2 / Column 2 → 7 (Hidden Single)
  17. Row 6 / Column 4 → 7 (Hidden Single)
  18. Row 3 / Column 6 → 4 (Hidden Single)
  19. Row 6 / Column 5 → 5 (Hidden Single)
  20. Row 2 / Column 4 → 5 (Hidden Single)
  21. Row 5 / Column 5 → 2 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 5 in b1 => r9c3<>5
  23. Locked Candidates Type 1 (Pointing): 6 in b1 => r6c1<>6
  24. Locked Candidates Type 1 (Pointing): 3 in b5 => r8c6<>3
  25. Locked Candidates Type 1 (Pointing): 9 in b6 => r13c7<>9
  26. Locked Candidates Type 1 (Pointing): 1 in b7 => r9c9<>1
  27. Locked Candidates Type 1 (Pointing): 2 in b7 => r9c9<>2
  28. Locked Candidates Type 1 (Pointing): 5 in b9 => r13c9<>5
  29. Uniqueness Test 6: 3/5 in r8c29,r9c29 => r8c9,r9c2<>5
  30. Row 8 / Column 2 → 5 (Hidden Single)
  31. Row 9 / Column 9 → 5 (Hidden Single)
  32. Hidden Rectangle: 1/8 in r1c45,r7c45 => r1c5<>1
  33. Hidden Rectangle: 1/3 in r7c59,r8c59 => r7c5<>1
  34. Discontinuous Nice Loop: 2 r1c1 -2- r6c1 -3- r6c6 -9- r5c4 =9= r1c4 =8= r1c5 =6= r1c1 => r1c1<>2
  35. Give Up: Don't know how to proceed!
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