Variations on Difficult Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 6: Eight Difficult HyperSudoku-by5 Puzzles (numbers 25-32) 
 
-  Step-by-step instructions for solving  Puzzle 25, (222/369)   Diff: 9/9.9999.9862
 -  Step-by-step instructions for solving  Puzzle 26, (243/369)   Diff: 10/99.9999.9996
 -  Step-by-step instructions for solving  Puzzle 27, (236/369)   Diff: 11/999.9999.8542
 -  Step-by-step instructions for solving  Puzzle 28, (245/369)   Diff: 11/999.9999.9995
 -  Step-by-step instructions for solving  Puzzle 29, (248/369)   Diff: 12/9999.9999.9551
 -  Step-by-step instructions for solving  Puzzle 30, (237/369)   Diff: 13/9.9999.41B2.5784
 -  Step-by-step instructions for solving  Puzzle 31, (259/369)   Diff: 13/9.9999.9999.9995
 -  Step-by-step instructions for solving  Puzzle 32, (231/369)   Diff: 14/99.9994.242A.3893