Challenging Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 42: Two Challenging (DiffLev 19) Productively Puzzles (numbers 163-164)
- Step-by-step instructions for solving Puzzle 163, (88/144) Diff: 19/963.4523.2332.3364.9762
- Step-by-step instructions for solving Puzzle 164, (88/144) Diff: 19/844.44C1.2634.1242.5993