Challenging Sudoku Twelve Logic Puzzles (Vol 1)
Chapter 54: Two Challenging (DiffLev 15-18) Unpredicably Puzzles (numbers 187-188)
- Step-by-step instructions for solving Puzzle 187, (89/144) Diff: 15/954.4342.2489.5998
- Step-by-step instructions for solving Puzzle 188, (96/144) Diff: 18/75.4769.4432.6648.4683