Easy Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 47: Two Easy (DiffLev 3-4) Supernotably Puzzles (numbers 173-174)
- Step-by-step instructions for solving Puzzle 173, (57/144) Diff: 3/992
- Step-by-step instructions for solving Puzzle 174, (67/144) Diff: 4/9991