Variations on Difficult Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 7: Eight Difficult HyperSudoku-Xtreme Puzzles (numbers 33-40) 
 
-  Step-by-step instructions for solving  Puzzle 33, (265/369)   Diff: 10/99.9999.9994
 -  Step-by-step instructions for solving  Puzzle 34, (252/369)   Diff: 11/999.9999.9997
 -  Step-by-step instructions for solving  Puzzle 35, (255/369)   Diff: 11/999.9999.9883
 -  Step-by-step instructions for solving  Puzzle 36, (259/369)   Diff: 11/999.9999.9992
 -  Step-by-step instructions for solving  Puzzle 37, (263/369)   Diff: 11/999.9999.7993
 -  Step-by-step instructions for solving  Puzzle 38, (240/369)   Diff: 13/9.9998.1112.4942
 -  Step-by-step instructions for solving  Puzzle 39, (264/369)   Diff: 13/9.9999.9999.9995
 -  Step-by-step instructions for solving  Puzzle 40, (265/369)   Diff: 13/9.9999.9997.8775