Variations on Advanced Sudoku Logic Puzzles (Vol 1)

Chapter 53: Four Difficult HyperSudoku-16 Puzzles (numbers 177-180)

• Step-by-step instructions for solving Puzzle 177, (146/256)   Diff: 10/99.9999.9995
• Step-by-step instructions for solving Puzzle 178, (149/256)   Diff: 10/99.9999.9997
• Step-by-step instructions for solving Puzzle 179, (149/256)   Diff: 12/9979.9899.9992
• Step-by-step instructions for solving Puzzle 180, (151/256)   Diff: 14/97.9995.5799.9992