Variations on Challenging Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 6: Eight Challenging HyperSudoku-by5 Puzzles (numbers 25-32) 
 
-  Step-by-step instructions for solving  Puzzle 25, (254/369)   Diff: 15/999.9999.9999.9995
 -  Step-by-step instructions for solving  Puzzle 26, (253/369)   Diff: 16/9999.9999.7567.5652
 -  Step-by-step instructions for solving  Puzzle 27, (260/369)   Diff: 16/9998.9999.9999.9952
 -  Step-by-step instructions for solving  Puzzle 28, (251/369)   Diff: 17/9.9999.9998.22B4.9742
 -  Step-by-step instructions for solving  Puzzle 29, (269/369)   Diff: 18/99.9999.9999.9999.9952
 -  Step-by-step instructions for solving  Puzzle 30, (233/369)   Diff: 19/999.9994.1A12.C432.4584
 -  Step-by-step instructions for solving  Puzzle 31, (258/369)   Diff: 19/999.9999.9876.6999.9841
 -  Step-by-step instructions for solving  Puzzle 32, (271/369)   Diff: 20/9969.9899.7999.9999.9997