Challenging Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 31: Two Challenging (DiffLev 15-20) Hyperstoical Puzzles (numbers 141-142)
- Step-by-step instructions for solving Puzzle 141, (93/144) Diff: 15/977.4445.2678.5793
- Step-by-step instructions for solving Puzzle 142, (93/144) Diff: 20/8364.5322.1BAA.2699.9943