Difficult Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 23: Two Difficult (DiffLev 10-12) Demonstrably Puzzles (numbers 125-126)
- Step-by-step instructions for solving Puzzle 125, (85/144) Diff: 10/95.6997.9994
- Step-by-step instructions for solving Puzzle 126, (86/144) Diff: 12/9633.3999.9761