Medium Sudoku Seven Logic Puzzles (Vol 1) 
 Chapter 7: Fourteen Medium (DiffLev 5-6) Sudoku-7B-2V Puzzles (numbers 57-70) 
 
-  Step-by-step instructions for solving  Puzzle 57, (33/49)   Diff: 5/9.6871
 -  Step-by-step instructions for solving  Puzzle 58, (33/49)   Diff: 5/9.4991
 -  Step-by-step instructions for solving  Puzzle 59, (33/49)   Diff: 5/7.8971
 -  Step-by-step instructions for solving  Puzzle 60, (34/49)   Diff: 5/8.7973
 -  Step-by-step instructions for solving  Puzzle 61, (38/49)   Diff: 5/4.8992
 -  Step-by-step instructions for solving  Puzzle 62, (35/49)   Diff: 6/94.5782
 -  Step-by-step instructions for solving  Puzzle 63, (35/49)   Diff: 6/65.4972
 -  Step-by-step instructions for solving  Puzzle 64, (35/49)   Diff: 6/57.9643
 -  Step-by-step instructions for solving  Puzzle 65, (36/49)   Diff: 6/89.8641
 -  Step-by-step instructions for solving  Puzzle 66, (37/49)   Diff: 6/79.4494
 -  Step-by-step instructions for solving  Puzzle 67, (37/49)   Diff: 6/75.5668
 -  Step-by-step instructions for solving  Puzzle 68, (37/49)   Diff: 6/66.9654
 -  Step-by-step instructions for solving  Puzzle 69, (37/49)   Diff: 6/65.5991
 -  Step-by-step instructions for solving  Puzzle 70, (37/49)   Diff: 6/44.9983