Difficult Sudoku Eight Logic Puzzles (Vol 1) 
 Chapter 11: Sixteen Difficult (DiffLev 9-10) HyperSudoku-8up Puzzles (numbers 127-142) 
 
-  Step-by-step instructions for solving  Puzzle 127, (40/64)   Diff: 9/7.3411.4866
 -  Step-by-step instructions for solving  Puzzle 128, (43/64)   Diff: 9/4.1345.7784
 -  Step-by-step instructions for solving  Puzzle 129, (44/64)   Diff: 9/8.4563.6732
 -  Step-by-step instructions for solving  Puzzle 130, (44/64)   Diff: 9/6.3123.9991
 -  Step-by-step instructions for solving  Puzzle 131, (45/64)   Diff: 9/6.4354.5864
 -  Step-by-step instructions for solving  Puzzle 132, (46/64)   Diff: 9/5.5554.4864
 -  Step-by-step instructions for solving  Puzzle 133, (47/64)   Diff: 9/5.4776.6651
 -  Step-by-step instructions for solving  Puzzle 134, (47/64)   Diff: 9/4.5646.9642
 -  Step-by-step instructions for solving  Puzzle 135, (41/64)   Diff: 10/52.2234.7781
 -  Step-by-step instructions for solving  Puzzle 136, (42/64)   Diff: 10/61.3643.5581
 -  Step-by-step instructions for solving  Puzzle 137, (44/64)   Diff: 10/68.5443.3551
 -  Step-by-step instructions for solving  Puzzle 138, (45/64)   Diff: 10/43.1357.9571
 -  Step-by-step instructions for solving  Puzzle 139, (46/64)   Diff: 10/87.4133.6851
 -  Step-by-step instructions for solving  Puzzle 140, (47/64)   Diff: 10/97.3344.6532
 -  Step-by-step instructions for solving  Puzzle 141, (47/64)   Diff: 10/76.4666.2451
 -  Step-by-step instructions for solving  Puzzle 142, (47/64)   Diff: 10/55.7455.3553