Easy Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 18: Two Easy (DiffLev 3-4) Backpointers Puzzles (numbers 115-116)
- Step-by-step instructions for solving Puzzle 115, (51/144) Diff: 3/994
- Step-by-step instructions for solving Puzzle 116, (67/144) Diff: 4/9998