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# Sudoku

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• Sudoku techniques Sudoku solving technique #1 Sole Candidate When all the other possibilities for the sudoku cell have been removed, and only one choice remains - then it must be the correct value. Sudoku solving technique #2 Unique Candidate If a cell is the only one in the row that can contain a certain number, then it must have that number. This is because every row of the sudoku must have each of the values 1-9. The same applies to columns and 3x3 blocks in the sudoku. Sudoku solving technique #3 Col/Row/Block interactions If you know that a number must occur in a certain row, then you can eliminate that number as a possibilty for other blocks in the same row. Eg, if you know that the number 4 must appear in the 1st row of block 1 (2nd and 3rd rows being full) then you know that the number 4 cannot occur in block 2 or 3 in the sudoku. This applies to columns as well. Sudoku solving technique #4 Naked subset if 2 squares in the same col/row/block have the same 2 candidates, then you can remove those numbers as candidates in the same col/row/block. This rule extends to cover 3 squares with the same 3 candidates, 4 etc.
• ### Transcript

• 2. Easy 4 by 4 puzzleA. 4 3 1 4 3 4 1 2 For answers click once.
• 3. Easy 4 by 4 puzzleA. 4 3 1 2 2 1 3 4 3 2 4 1 1 4 2 3
• 4. Easy 4 by 4 puzzleB. 1 4 3 1 1 3 4 1 For answers click once.
• 5. Easy 4 by 4 puzzleB. 3 1 4 2 4 2 3 1 1 3 2 4 2 4 1 3
• 6. Easy 4 by 4 puzzleC. 4 2 3 3 4 3 4 4 2 For answers click once.
• 7. Easy 4 by 4 puzzleC. 4 1 2 3 2 3 1 4 3 2 4 1 1 4 3 2
• 8. Easy 4 by 4 puzzleD. 3 1 4 2 1 4 4 3 For answers click once.
• 9. Easy 4 by 4 puzzleD. 3 1 4 2 4 2 3 1 2 3 1 4 1 4 2 3
• 10. 4 by 4 puzzleE. 3 4 2 3 1 3 2 1 For answers click once.
• 11. 4 by 4 puzzleE. 1 3 4 2 2 4 3 1 4 1 2 3 3 2 1 4
• 12. 4 by 4 puzzleF. 2 4 1 4 4 1 2 3 For answers click once.
• 13. 4 by 4 puzzleF. 2 3 4 1 4 1 3 2 3 2 1 4 1 4 2 3
• 14. 4 by 4 puzzleG. 3 1 4 1 1 4 1 3 For answers click once.
• 15. 4 by 4 puzzleG. 3 1 4 2 4 2 3 1 1 3 2 4 2 4 1 3
• 16. 4 by 4 puzzleH. 1 4 2 1 4 2 3 4 For answers click once.
• 17. 4 by 4 puzzleH. 1 4 2 3 3 2 4 1 4 1 3 2 2 3 1 4
• 18. Easy 6 by 6 puzzleI. 2 4 3 5 2 6 4 5 3 4 2 1 2 1 4 5 5 6 For answers click once.
• 19. Easy 6 by 6 puzzleI. 6 2 4 3 1 5 1 3 5 2 4 6 4 5 6 1 3 2 5 4 3 6 2 1 2 6 1 4 5 3 3 1 2 5 6 4
• 20. Easy 6 by 6 puzzleJ. 3 2 5 6 4 1 6 3 4 2 4 5 1 3 5 1 4 2 For answers click once.
• 21. Easy 6 by 6 puzzleJ. 3 2 1 4 5 6 6 4 5 2 1 3 1 5 6 3 2 4 2 3 4 5 6 1 4 6 2 1 3 5 5 1 3 6 4 2
• 22. 6 by 6 puzzleK. 5 2 1 3 1 6 3 4 2 4 1 3 5 6 5 2 4 6 For answers click once.
• 23. 6 by 6 puzzleK. 6 4 5 2 1 3 1 5 6 3 4 2 2 3 1 4 6 5 3 6 2 1 5 4 4 1 3 5 2 6 5 2 4 6 3 1
• 24. Hard 6 by 6 puzzleL. 5 6 6 3 5 3 3 2 5 4 1 5 For answers click once.
• 25. Hard 6 by 6 puzzleL. 1 5 6 2 3 4 4 6 1 3 2 5 3 2 4 5 1 6 5 1 2 4 6 3 2 3 5 6 4 1 6 4 3 1 5 2
• 26. Hard 6 by 6 puzzleM. 5 1 2 6 2 4 6 5 2 3 1 2 For answers click once.
• 27. Hard 6 by 6 puzzleM. 3 4 5 1 2 6 6 5 2 4 1 3 1 2 3 6 4 5 2 6 4 3 5 1 4 1 6 5 3 2 5 3 1 2 6 4
• 28. 9 6 2 7 N. 4 3 8 6 8 1 9 2 1 5 8 3 4 9 puzzle 7 9 9 8 6 5 1 39 by 9 5 9 7 3 2 9 6 4 8 4 2 1 5 For a hint click once; for answers click twice.
• 29. 5 9 3 8 6 2 1 4 7 N. 7 2 4 1 5 3 9 8 6 6 8 1 9 7 4 2 3 5 1 5 8 3 4 9 7 6 2 puzzle 3 7 6 5 2 1 4 9 8 2 4 9 7 8 6 5 1 39 by 9 8 1 5 6 9 7 3 2 4 9 6 2 4 3 5 8 7 1 4 3 7 2 1 8 6 5 9