Variations on Advanced Sudoku Logic Puzzles (Vol 1)

Chapter 48: Four Challenging Sudoku-16 Puzzles (numbers 161-164)

• Step-by-step instructions for solving Puzzle 161, (141/256)   Diff: 19/997.9984.5212.2C89.9951
• Step-by-step instructions for solving Puzzle 162, (142/256)   Diff: 19/999.7942.2489.9867.9764
• Step-by-step instructions for solving Puzzle 163, (141/256)   Diff: 20/9976.5341.12D4.7999.9961
• Step-by-step instructions for solving Puzzle 164, (142/256)   Diff: 20/9754.3521.4579.9999.9942