Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 27: Three Challenging HyperSudoku-by5 Puzzles (numbers 73-75) 
 
-  Step-by-step instructions for solving  Puzzle 73, (258/369)   Diff: 15/999.9999.9986.2357
 -  Step-by-step instructions for solving  Puzzle 74, (269/369)   Diff: 19/997.7799.9999.9999.9894
 -  Step-by-step instructions for solving  Puzzle 75, (264/369)   Diff: 20/9999.9999.9999.9999.9995