Medium Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 55: Two Medium (DiffLev 6-7) Voluntaryism Puzzles (numbers 189-190)
- Step-by-step instructions for solving Puzzle 189, (78/144) Diff: 6/99.9991
- Step-by-step instructions for solving Puzzle 190, (82/144) Diff: 7/999.9992