Challenging Sudoku Seven Logic Puzzles (Vol 1) 
 Chapter 15: Fourteen Challenging (DiffLev 13) Sudoku-7D Puzzles (numbers 163-176) 
 
-  Step-by-step instructions for solving  Puzzle 163, (37/49)   Diff: 13/4.3211.2245.3451
 -  Step-by-step instructions for solving  Puzzle 164, (37/49)   Diff: 13/1.222A.1121.3696
 -  Step-by-step instructions for solving  Puzzle 165, (37/49)   Diff: 13/1.212A.2121.3588
 -  Step-by-step instructions for solving  Puzzle 166, (38/49)   Diff: 13/2.321B.1221.3784
 -  Step-by-step instructions for solving  Puzzle 167, (39/49)   Diff: 13/A.121A.1444.3485
 -  Step-by-step instructions for solving  Puzzle 168, (39/49)   Diff: 13/5.2333.1234.3343
 -  Step-by-step instructions for solving  Puzzle 169, (39/49)   Diff: 13/4.2321.1125.4941
 -  Step-by-step instructions for solving  Puzzle 170, (39/49)   Diff: 13/4.2111.2124.4674
 -  Step-by-step instructions for solving  Puzzle 171, (39/49)   Diff: 13/3.311A.1322.4675
 -  Step-by-step instructions for solving  Puzzle 172, (39/49)   Diff: 13/2.2221.A124.4792
 -  Step-by-step instructions for solving  Puzzle 173, (39/49)   Diff: 13/1.AA22.1244.2388
 -  Step-by-step instructions for solving  Puzzle 174, (40/49)   Diff: 13/3.1122.5553.1462
 -  Step-by-step instructions for solving  Puzzle 175, (40/49)   Diff: 13/2.221B.1344.3655
 -  Step-by-step instructions for solving  Puzzle 176, (40/49)   Diff: 13/1.2252.1474.2361