Difficult Sudoku Eight Logic Puzzles (Vol 1) 
 Chapter 12: Sixteen Difficult (DiffLev 11-12) HyperSudoku-8up Puzzles (numbers 143-158) 
 
-  Step-by-step instructions for solving  Puzzle 143, (47/64)   Diff: 11/654.2133.4991
 -  Step-by-step instructions for solving  Puzzle 144, (43/64)   Diff: 12/6223.3322.4961
 -  Step-by-step instructions for solving  Puzzle 145, (44/64)   Diff: 12/72C2.1122.6765
 -  Step-by-step instructions for solving  Puzzle 146, (44/64)   Diff: 12/32A1.1433.4976
 -  Step-by-step instructions for solving  Puzzle 147, (45/64)   Diff: 12/9632.2133.2336
 -  Step-by-step instructions for solving  Puzzle 148, (45/64)   Diff: 12/7432.1223.2397
 -  Step-by-step instructions for solving  Puzzle 149, (45/64)   Diff: 12/6411.1342.3884
 -  Step-by-step instructions for solving  Puzzle 150, (45/64)   Diff: 12/552A.A134.5954
 -  Step-by-step instructions for solving  Puzzle 151, (45/64)   Diff: 12/3441.3332.3577
 -  Step-by-step instructions for solving  Puzzle 152, (46/64)   Diff: 12/5635.2123.5545
 -  Step-by-step instructions for solving  Puzzle 153, (46/64)   Diff: 12/3333.1453.3666
 -  Step-by-step instructions for solving  Puzzle 154, (47/64)   Diff: 12/5434.1135.9633
 -  Step-by-step instructions for solving  Puzzle 155, (47/64)   Diff: 12/5433.2453.5544
 -  Step-by-step instructions for solving  Puzzle 156, (47/64)   Diff: 12/4467.4323.4541
 -  Step-by-step instructions for solving  Puzzle 157, (48/64)   Diff: 12/6533.1222.9753
 -  Step-by-step instructions for solving  Puzzle 158, (49/64)   Diff: 12/4554.3422.4664