Medium Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 30: Two Medium (DiffLev 5-7) Headstrongly Puzzles (numbers 139-140)
- Step-by-step instructions for solving Puzzle 139, (74/144) Diff: 5/9.9992
- Step-by-step instructions for solving Puzzle 140, (79/144) Diff: 7/999.8995