Medium Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 18: Two Medium (DiffLev 7) Backpointers Puzzles (numbers 115-116)
- Step-by-step instructions for solving Puzzle 115, (82/144) Diff: 7/999.9992
- Step-by-step instructions for solving Puzzle 116, (82/144) Diff: 7/999.9943