Medium Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 19: Two Medium (DiffLev 6) Columnarized Puzzles (numbers 117-118)
- Step-by-step instructions for solving Puzzle 117, (69/144) Diff: 6/99.9351
- Step-by-step instructions for solving Puzzle 118, (81/144) Diff: 6/99.9963