Difficult Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 17: Two Difficult (DiffLev 13-14) Ambidextrous Puzzles (numbers 113-114)
- Step-by-step instructions for solving Puzzle 113, (90/144) Diff: 13/9.9899.4459.5353
- Step-by-step instructions for solving Puzzle 114, (93/144) Diff: 14/98.6559.9755.7561