Variations on Difficult Sudoku-by5 Logic Puzzles (Vol 1)

Chapter 4: Eight Difficult Sudoku-Xtreme Puzzles (numbers 9-16)

• Step-by-step instructions for solving Puzzle 9, (238/369)   Diff: 10/99.9999.6573
• Step-by-step instructions for solving Puzzle 10, (250/369)   Diff: 11/999.9996.8891
• Step-by-step instructions for solving Puzzle 11, (262/369)   Diff: 13/9.9999.9993.3533
• Step-by-step instructions for solving Puzzle 12, (263/369)   Diff: 13/9.9999.9989.9999
• Step-by-step instructions for solving Puzzle 13, (267/369)   Diff: 13/9.9999.9999.9955
• Step-by-step instructions for solving Puzzle 14, (271/369)   Diff: 13/9.9999.9999.9983
• Step-by-step instructions for solving Puzzle 15, (261/369)   Diff: 14/99.9999.992B.4474
• Step-by-step instructions for solving Puzzle 16, (262/369)   Diff: 14/99.9999.9999.4675