Variations on Challenging Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 3: Eight Challenging Sudoku-by5 Puzzles (numbers 1-8) 
 
-  Step-by-step instructions for solving  Puzzle 1, (237/369)   Diff: 16/9999.9999.7578.9984
 -  Step-by-step instructions for solving  Puzzle 2, (246/369)   Diff: 17/9.9999.9999.94B3.6962
 -  Step-by-step instructions for solving  Puzzle 3, (256/369)   Diff: 17/9.9999.9996.7999.9561
 -  Step-by-step instructions for solving  Puzzle 4, (259/369)   Diff: 17/9.9799.9999.9999.5356
 -  Step-by-step instructions for solving  Puzzle 5, (244/369)   Diff: 18/99.9999.9989.8953.4532
 -  Step-by-step instructions for solving  Puzzle 6, (262/369)   Diff: 19/999.4999.9999.9999.9995
 -  Step-by-step instructions for solving  Puzzle 7, (226/369)   Diff: 20/9999.9997.83AA.1A13.6763
 -  Step-by-step instructions for solving  Puzzle 8, (253/369)   Diff: 20/9999.9999.9995.3666.4643