Difficult Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 43: Two Difficult (DiffLev 11-13) Projectingly Puzzles (numbers 165-166)
- Step-by-step instructions for solving Puzzle 165, (85/144) Diff: 11/999.7565.6991
- Step-by-step instructions for solving Puzzle 166, (86/144) Diff: 13/9.9733.3579.7793