Challenging Sudoku Eight Logic Puzzles (Vol 1) 
 Chapter 11: Sixteen Challenging (DiffLev 13) HyperSudoku-8up Puzzles (numbers 127-142) 
 
-  Step-by-step instructions for solving  Puzzle 127, (41/64)   Diff: 13/4.B222.3213.4492
 -  Step-by-step instructions for solving  Puzzle 128, (42/64)   Diff: 13/7.1B53.1122.4644
 -  Step-by-step instructions for solving  Puzzle 129, (42/64)   Diff: 13/5.3112.3136.8351
 -  Step-by-step instructions for solving  Puzzle 130, (44/64)   Diff: 13/4.3432.3433.4632
 -  Step-by-step instructions for solving  Puzzle 131, (45/64)   Diff: 13/4.3131.3145.8831
 -  Step-by-step instructions for solving  Puzzle 132, (46/64)   Diff: 13/5.3244.2111.6791
 -  Step-by-step instructions for solving  Puzzle 133, (46/64)   Diff: 13/5.2483.3312.1464
 -  Step-by-step instructions for solving  Puzzle 134, (46/64)   Diff: 13/4.4421.1455.4462
 -  Step-by-step instructions for solving  Puzzle 135, (46/64)   Diff: 13/4.3222.2545.4652
 -  Step-by-step instructions for solving  Puzzle 136, (46/64)   Diff: 13/4.2B21.2214.6866
 -  Step-by-step instructions for solving  Puzzle 137, (46/64)   Diff: 13/3.541A.2446.3445
 -  Step-by-step instructions for solving  Puzzle 138, (46/64)   Diff: 13/3.1B33.2348.3563
 -  Step-by-step instructions for solving  Puzzle 139, (47/64)   Diff: 13/7.2531.2254.6361
 -  Step-by-step instructions for solving  Puzzle 140, (47/64)   Diff: 13/4.1B11.3475.5563
 -  Step-by-step instructions for solving  Puzzle 141, (48/64)   Diff: 13/5.4653.3334.2334
 -  Step-by-step instructions for solving  Puzzle 142, (48/64)   Diff: 13/4.2321.2226.7971