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

This Sudoku Puzzle has 75 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Finned Swordfish, Continuous Nice Loop, Grouped Discontinuous Nice Loop, undefined, Naked Single, Full House techniques.

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

Solution Steps:

  1. Row 4 / Column 7 → 7 (Hidden Single)
  2. Row 5 / Column 5 → 2 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 4 in b5 => r78c4<>4
  4. Locked Candidates Type 1 (Pointing): 8 in b5 => r12c6<>8
  5. Locked Candidates Type 1 (Pointing): 5 in b8 => r7c789<>5
  6. Finned Swordfish: 1 c157 r357 fr2c7 => r3c9<>1
  7. Locked Candidates Type 1 (Pointing): 1 in b3 => r5c7<>1
  8. Continuous Nice Loop: 1/2/4/8/9 2= r6c9 =1= r5c9 -1- r5c1 =1= r7c1 =2= r3c1 -2- r3c9 =2= r6c9 =1 => r5c36<>1, r3c23<>2, r6c9,r7c1<>4, r6c9,r7c1<>8, r7c1<>9
  9. Grouped Discontinuous Nice Loop: 8 r1c3 -8- r1c5 =8= r3c5 =1= r7c5 -1- r7c1 =1= r5c1 =8= r13c1 -8- r1c3 => r1c3<>8
  10. Grouped Discontinuous Nice Loop: 8 r1c7 -8- r1c5 =8= r3c5 =1= r7c5 -1- r7c1 =1= r5c1 =8= r13c1 -8- r2c23 =8= r2c78 -8- r1c7 => r1c7<>8
  11. Grouped Discontinuous Nice Loop: 8 r1c9 -8- r1c5 =8= r3c5 =1= r7c5 -1- r7c1 =1= r5c1 =8= r13c1 -8- r2c23 =8= r2c78 -8- r1c9 => r1c9<>8
  12. Grouped Discontinuous Nice Loop: 1 r6c4 -1- r6c9 =1= r5c9 -1- r5c1 =1= r7c1 -1- r7c5 =1= r3c5 =8= r1c5 =6= r1c6 -6- r56c6 =6= r6c4 => r6c4<>1
  13. Grouped Discontinuous Nice Loop: 1 r7c6 -1- r7c5 =1= r3c5 =8= r1c5 =6= r1c6 -6- r56c6 =6= r6c4 =4= r4c4 =1= r46c6 -1- r7c6 => r7c6<>1
  14. Grouped Discontinuous Nice Loop: 1 r8c6 -1- r7c5 =1= r3c5 =8= r1c5 =6= r1c6 -6- r56c6 =6= r6c4 =4= r4c4 =1= r46c6 -1- r8c6 => r8c6<>1
  15. Almost Locked Set XZ-Rule: A=r1c179 {4589}, B=r3c1579 {12589}, X=5, Z=8 => r3c23<>8
  16. Almost Locked Set XZ-Rule: A=r1c179 {4589}, B=r3c57 {158}, X=5, Z=8 => r3c1<>8
  17. XY-Chain: 1 1- r3c5 -8- r1c5 -6- r9c5 -4- r9c1 -9- r3c1 -2- r7c1 -1 => r7c5<>1
  18. Row 3 / Column 5 → 1 (Hidden Single)
  19. Row 2 / Column 7 → 1 (Hidden Single)
  20. Row 1 / Column 5 → 8 (Hidden Single)
  21. Row 5 / Column 1 → 8 (Hidden Single)
  22. Row 1 / Column 6 → 6 (Hidden Single)
  23. Row 5 / Column 6 → 3 (Naked Single)
  24. Row 5 / Column 9 → 1 (Hidden Single)
  25. Row 6 / Column 9 → 2 (Naked Single)
  26. Row 7 / Column 1 → 1 (Hidden Single)
  27. Row 6 / Column 4 → 6 (Hidden Single)
  28. Row 6 / Column 2 → 4 (Naked Single)
  29. Row 6 / Column 3 → 1 (Naked Single)
  30. Row 6 / Column 6 → 8 (Naked Single)
  31. Row 6 / Column 8 → 3 (Full House)
  32. Row 4 / Column 6 → 1 (Naked Single)
  33. Row 4 / Column 4 → 4 (Full House)
  34. Row 1 / Column 3 → 3 (Hidden Single)
  35. Row 3 / Column 4 → 3 (Hidden Single)
  36. Row 3 / Column 1 → 2 (Hidden Single)
  37. Row 2 / Column 8 → 2 (Hidden Single)
  38. Row 8 / Column 4 → 1 (Hidden Single)
  39. Row 4 / Column 8 → 8 (Hidden Single)
  40. Row 2 / Column 3 → 4 (Hidden Single)
  41. Row 1 / Column 1 → 9 (Naked Single)
  42. Row 9 / Column 1 → 4 (Full House)
  43. Row 9 / Column 5 → 6 (Naked Single)
  44. Row 7 / Column 5 → 4 (Full House)
  45. Row 7 / Column 8 → 9 (Naked Single)
  46. Row 7 / Column 4 → 5 (Naked Single)
  47. Row 2 / Column 4 → 9 (Full House)
  48. Row 2 / Column 6 → 5 (Full House)
  49. Row 2 / Column 2 → 8 (Full House)
  50. Row 8 / Column 8 → 4 (Naked Single)
  51. Row 5 / Column 8 → 5 (Full House)
  52. Row 5 / Column 7 → 4 (Full House)
  53. Row 7 / Column 6 → 7 (Naked Single)
  54. Row 8 / Column 6 → 9 (Full House)
  55. Row 1 / Column 7 → 5 (Naked Single)
  56. Row 1 / Column 9 → 4 (Full House)
  57. Row 7 / Column 9 → 8 (Naked Single)
  58. Row 3 / Column 7 → 8 (Naked Single)
  59. Row 3 / Column 9 → 9 (Full House)
  60. Row 9 / Column 7 → 3 (Naked Single)
  61. Row 7 / Column 7 → 6 (Full House)
  62. Row 8 / Column 9 → 7 (Naked Single)
  63. Row 9 / Column 9 → 5 (Full House)
  64. Row 7 / Column 3 → 2 (Naked Single)
  65. Row 7 / Column 2 → 3 (Full House)
  66. Row 8 / Column 2 → 6 (Naked Single)
  67. Row 8 / Column 3 → 8 (Full House)
  68. Row 4 / Column 3 → 5 (Naked Single)
  69. Row 4 / Column 2 → 2 (Full House)
  70. Row 5 / Column 2 → 9 (Naked Single)
  71. Row 5 / Column 3 → 6 (Full House)
  72. Row 3 / Column 3 → 7 (Naked Single)
  73. Row 3 / Column 2 → 5 (Full House)
  74. Row 9 / Column 2 → 7 (Full House)
  75. Row 9 / Column 3 → 9 (Full House)
Show More...