Medium Sudoku Seven Logic Puzzles (Vol 1) 
 Chapter 16: Fourteen Medium (DiffLev 7-8) Sudoku-7D Puzzles (numbers 177-190) 
 
-  Step-by-step instructions for solving  Puzzle 177, (34/49)   Diff: 7/322.3798
 -  Step-by-step instructions for solving  Puzzle 178, (35/49)   Diff: 7/675.7541
 -  Step-by-step instructions for solving  Puzzle 179, (34/49)   Diff: 8/7343.4571
 -  Step-by-step instructions for solving  Puzzle 180, (34/49)   Diff: 8/6333.3682
 -  Step-by-step instructions for solving  Puzzle 181, (35/49)   Diff: 8/7323.3566
 -  Step-by-step instructions for solving  Puzzle 182, (37/49)   Diff: 8/8333.2774
 -  Step-by-step instructions for solving  Puzzle 183, (37/49)   Diff: 8/5783.1355
 -  Step-by-step instructions for solving  Puzzle 184, (38/49)   Diff: 8/7621.3269
 -  Step-by-step instructions for solving  Puzzle 185, (38/49)   Diff: 8/4643.4575
 -  Step-by-step instructions for solving  Puzzle 186, (38/49)   Diff: 8/4375.4474
 -  Step-by-step instructions for solving  Puzzle 187, (39/49)   Diff: 8/5452.3686
 -  Step-by-step instructions for solving  Puzzle 188, (39/49)   Diff: 8/5223.7982
 -  Step-by-step instructions for solving  Puzzle 189, (39/49)   Diff: 8/3256.7961
 -  Step-by-step instructions for solving  Puzzle 190, (40/49)   Diff: 8/3269.5771