Difficult Sudoku Twelve Logic Puzzles (Vol 1)

Chapter 50: Two Difficult (DiffLev 10-11) Unformalized Puzzles (numbers 179-180)

• Step-by-step instructions for solving Puzzle 179, (84/144)   Diff: 10/98.8769.9792
• Step-by-step instructions for solving Puzzle 180, (87/144)   Diff: 11/975.6456.9996