Difficult Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 20: Two Difficult (DiffLev 11-13) Combustively Puzzles (numbers 119-120)
- Step-by-step instructions for solving Puzzle 119, (88/144) Diff: 11/999.9687.8783
- Step-by-step instructions for solving Puzzle 120, (87/144) Diff: 13/9.6443.6998.8571