Difficult Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 38: Two Difficult (DiffLev 12-14) Outsparkling Puzzles (numbers 155-156)
- Step-by-step instructions for solving Puzzle 155, (93/144) Diff: 12/7895.7238.9995
- Step-by-step instructions for solving Puzzle 156, (90/144) Diff: 14/98.4364.3459.9972