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

This Sudoku Puzzle has 53 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Uniqueness Test 1, 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 7 / Column 5 → 4 (Hidden Single)
  2. Row 9 / Column 1 → 4 (Hidden Single)
  3. Row 6 / Column 6 → 9 (Hidden Single)
  4. Row 8 / Column 4 → 7 (Hidden Single)
  5. Row 9 / Column 7 → 6 (Hidden Single)
  6. Row 9 / Column 5 → 2 (Naked Single)
  7. Row 9 / Column 6 → 8 (Naked Single)
  8. Row 9 / Column 2 → 7 (Naked Single)
  9. Row 9 / Column 3 → 3 (Full House)
  10. Row 2 / Column 6 → 4 (Hidden Single)
  11. Row 6 / Column 4 → 4 (Hidden Single)
  12. Row 2 / Column 4 → 2 (Hidden Single)
  13. Row 3 / Column 1 → 7 (Hidden Single)
  14. Row 4 / Column 3 → 7 (Hidden Single)
  15. Row 3 / Column 7 → 2 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 1 in b5 => r4c18<>1
  17. Locked Candidates Type 1 (Pointing): 1 in b8 => r8c123<>1
  18. Locked Candidates Type 2 (Claiming): 1 in c1 => r5c23,r6c2<>1
  19. Row 6 / Column 2 → 5 (Naked Single)
  20. Row 6 / Column 9 → 7 (Naked Single)
  21. Row 2 / Column 9 → 6 (Naked Single)
  22. Row 7 / Column 9 → 2 (Naked Single)
  23. Row 4 / Column 9 → 8 (Naked Single)
  24. Row 8 / Column 8 → 9 (Naked Single)
  25. Row 7 / Column 8 → 7 (Full House)
  26. Row 4 / Column 1 → 3 (Naked Single)
  27. Row 8 / Column 1 → 8 (Naked Single)
  28. Row 8 / Column 3 → 5 (Naked Single)
  29. Row 4 / Column 8 → 2 (Naked Single)
  30. Row 6 / Column 1 → 1 (Naked Single)
  31. Row 5 / Column 1 → 9 (Full House)
  32. Row 6 / Column 7 → 3 (Full House)
  33. Row 8 / Column 2 → 2 (Naked Single)
  34. Row 5 / Column 3 → 6 (Naked Single)
  35. Row 5 / Column 2 → 8 (Full House)
  36. Row 2 / Column 7 → 7 (Hidden Single)
  37. Row 1 / Column 8 → 8 (Hidden Single)
  38. Row 3 / Column 2 → 6 (Hidden Single)
  39. Row 1 / Column 9 → 4 (Hidden Single)
  40. Row 5 / Column 9 → 5 (Full House)
  41. Row 5 / Column 7 → 1 (Naked Single)
  42. Row 1 / Column 7 → 5 (Full House)
  43. Row 5 / Column 8 → 4 (Full House)
  44. Uniqueness Test 1: 1/3 in r2c58,r3c58 => r2c5<>1, r2c5<>3
  45. Row 2 / Column 5 → 9 (Naked Single)
  46. Row 2 / Column 2 → 1 (Naked Single)
  47. Row 1 / Column 3 → 9 (Full House)
  48. Row 2 / Column 8 → 3 (Full House)
  49. Row 7 / Column 2 → 9 (Full House)
  50. Row 7 / Column 3 → 1 (Full House)
  51. Row 3 / Column 8 → 1 (Full House)
  52. Row 3 / Column 5 → 3 (Full House)
  53. Give Up: Don't know how to proceed!
Show More...