Variations on Advanced Sudoku Logic Puzzles (Vol 1)

Chapter 35: Four Difficult Sudoku-15up Puzzles (numbers 115-118)

• Step-by-step instructions for solving Puzzle 115, (112/225)   Diff: 9/9.9999.9872
• Step-by-step instructions for solving Puzzle 116, (116/225)   Diff: 10/99.9998.8543
• Step-by-step instructions for solving Puzzle 117, (116/225)   Diff: 10/99.9969.9995
• Step-by-step instructions for solving Puzzle 118, (121/225)   Diff: 14/98.9864.5999.9942