Easy Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 40: Two Easy (DiffLev 3-4) Overstudying Puzzles (numbers 159-160)
- Step-by-step instructions for solving Puzzle 159, (48/144) Diff: 3/991
- Step-by-step instructions for solving Puzzle 160, (66/144) Diff: 4/9999