Easy Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 49: Two Easy (DiffLev 3-4) Turbomachine Puzzles (numbers 177-178)
- Step-by-step instructions for solving Puzzle 177, (55/144) Diff: 3/991
- Step-by-step instructions for solving Puzzle 178, (71/144) Diff: 4/9993