Medium Sudoku Five Logic Puzzles (Vol 1) 
 Chapter 16: Twelve Medium (DiffLev 6) Sudoku-5C Puzzles (numbers 157-168) 
 
-  Step-by-step instructions for solving  Puzzle 157, (18/25)   Diff: 6/52.2243
 -  Step-by-step instructions for solving  Puzzle 158, (18/25)   Diff: 6/34.3332
 -  Step-by-step instructions for solving  Puzzle 159, (19/25)   Diff: 6/62.1361
 -  Step-by-step instructions for solving  Puzzle 160, (19/25)   Diff: 6/33.3433
 -  Step-by-step instructions for solving  Puzzle 161, (19/25)   Diff: 6/32.2246
 -  Step-by-step instructions for solving  Puzzle 162, (19/25)   Diff: 6/22.3633
 -  Step-by-step instructions for solving  Puzzle 163, (20/25)   Diff: 6/43.4252
 -  Step-by-step instructions for solving  Puzzle 164, (20/25)   Diff: 6/43.3433
 -  Step-by-step instructions for solving  Puzzle 165, (20/25)   Diff: 6/34.4432
 -  Step-by-step instructions for solving  Puzzle 166, (20/25)   Diff: 6/33.3542
 -  Step-by-step instructions for solving  Puzzle 167, (20/25)   Diff: 6/33.3335
 -  Step-by-step instructions for solving  Puzzle 168, (20/25)   Diff: 6/24.3452