Medium Sudoku Seven Logic Puzzles (Vol 1) 
 Chapter 13: Fourteen Medium (DiffLev 5-6) Sudoku-7C-2V Puzzles (numbers 137-150) 
 
-  Step-by-step instructions for solving  Puzzle 137, (33/49)   Diff: 5/9.6881
 -  Step-by-step instructions for solving  Puzzle 138, (34/49)   Diff: 5/8.9832
 -  Step-by-step instructions for solving  Puzzle 139, (34/49)   Diff: 5/7.4499
 -  Step-by-step instructions for solving  Puzzle 140, (35/49)   Diff: 5/7.9954
 -  Step-by-step instructions for solving  Puzzle 141, (36/49)   Diff: 5/4.9893
 -  Step-by-step instructions for solving  Puzzle 142, (32/49)   Diff: 6/88.5551
 -  Step-by-step instructions for solving  Puzzle 143, (32/49)   Diff: 6/66.7652
 -  Step-by-step instructions for solving  Puzzle 144, (35/49)   Diff: 6/95.6752
 -  Step-by-step instructions for solving  Puzzle 145, (36/49)   Diff: 6/77.4567
 -  Step-by-step instructions for solving  Puzzle 146, (37/49)   Diff: 6/65.6981
 -  Step-by-step instructions for solving  Puzzle 147, (37/49)   Diff: 6/65.5992
 -  Step-by-step instructions for solving  Puzzle 148, (38/49)   Diff: 6/76.3679
 -  Step-by-step instructions for solving  Puzzle 149, (39/49)   Diff: 6/88.6692
 -  Step-by-step instructions for solving  Puzzle 150, (39/49)   Diff: 6/76.6794