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

This Sudoku Puzzle has 19 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 2 (Claiming), Grouped Discontinuous Nice Loop, undefined, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Uniqueness Test 1, Discontinuous Nice Loop, Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 8 / Column 1 → 2 (Naked Single)
  2. Row 8 / Column 9 → 4 (Naked Single)
  3. Row 8 / Column 3 → 8 (Naked Single)
  4. Row 1 / Column 4 → 8 (Hidden Single)
  5. Row 5 / Column 4 → 4 (Hidden Single)
  6. Row 1 / Column 8 → 4 (Hidden Single)
  7. Row 3 / Column 2 → 8 (Hidden Single)
  8. Row 3 / Column 3 → 7 (Hidden Single)
  9. Locked Candidates Type 2 (Claiming): 9 in c5 => r2c46,r3c4<>9
  10. Grouped Discontinuous Nice Loop: 1 r6c7 -1- r5c79 =1= r5c23 -1- r4c1 =1= r1c1 -1- r1c9 =1= r123c7 -1- r6c7 => r6c7<>1
  11. Almost Locked Set XZ-Rule: A=r2c23457 {123459}, B=r3468c4 {12579}, X=5, Z=2 => r2c6<>2
  12. Locked Candidates Type 1 (Pointing): 2 in b2 => r9c4<>2
  13. Naked Triple: 1,3,4 in r79c5,r9c4 => r79c6<>1
  14. Hidden Pair: 1,4 in r7c25 => r7c5<>3
  15. Locked Candidates Type 1 (Pointing): 3 in b8 => r9c8<>3
  16. Uniqueness Test 1: 2/8 in r7c68,r9c68 => r7c8<>2, r7c8<>8
  17. Row 7 / Column 8 → 3 (Naked Single)
  18. Discontinuous Nice Loop: 9 r6c7 -9- r5c8 -2- r9c8 -8- r6c8 =8= r6c7 => r6c7<>9
  19. Give Up: Don't know how to proceed!
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