Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 25: Three Medium HyperSudoku-by5 Puzzles (numbers 67-69) 
 
-  Step-by-step instructions for solving  Puzzle 67, (182/369)   Diff: 5/9.9962
 -  Step-by-step instructions for solving  Puzzle 68, (218/369)   Diff: 8/9999.9976
 -  Step-by-step instructions for solving  Puzzle 69, (235/369)   Diff: 8/9999.9994