Difficult Sudoku Eight Logic Puzzles (Vol 1) 
 Chapter 13: Sixteen Difficult (DiffLev 9-10) SuperSudoku-8 Puzzles (numbers 159-174) 
 
-  Step-by-step instructions for solving  Puzzle 159, (44/64)   Diff: 9/9.6444.5543
 -  Step-by-step instructions for solving  Puzzle 160, (47/64)   Diff: 9/8.6346.8543
 -  Step-by-step instructions for solving  Puzzle 161, (42/64)   Diff: 10/62.2322.4795
 -  Step-by-step instructions for solving  Puzzle 162, (43/64)   Diff: 10/86.5314.5542
 -  Step-by-step instructions for solving  Puzzle 163, (43/64)   Diff: 10/84.3314.3656
 -  Step-by-step instructions for solving  Puzzle 164, (43/64)   Diff: 10/53.3332.4686
 -  Step-by-step instructions for solving  Puzzle 165, (44/64)   Diff: 10/97.3242.6632
 -  Step-by-step instructions for solving  Puzzle 166, (44/64)   Diff: 10/96.3333.5651
 -  Step-by-step instructions for solving  Puzzle 167, (44/64)   Diff: 10/65.4344.4671
 -  Step-by-step instructions for solving  Puzzle 168, (45/64)   Diff: 10/93.4325.7444
 -  Step-by-step instructions for solving  Puzzle 169, (45/64)   Diff: 10/83.2457.5551
 -  Step-by-step instructions for solving  Puzzle 170, (45/64)   Diff: 10/62.3336.6781
 -  Step-by-step instructions for solving  Puzzle 171, (47/64)   Diff: 10/96.5522.3555
 -  Step-by-step instructions for solving  Puzzle 172, (47/64)   Diff: 10/96.5443.4244
 -  Step-by-step instructions for solving  Puzzle 173, (47/64)   Diff: 10/73.4644.5671
 -  Step-by-step instructions for solving  Puzzle 174, (47/64)   Diff: 10/66.3312.6983