Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 25: Eight Medium Sudoku-7C Puzzles (numbers 129-136) 
 
-  Step-by-step instructions for solving  Puzzle 129, (32/49)   Diff: 5/6.6991
 -  Step-by-step instructions for solving  Puzzle 130, (31/49)   Diff: 6/96.3462
 -  Step-by-step instructions for solving  Puzzle 131, (32/49)   Diff: 6/76.5581
 -  Step-by-step instructions for solving  Puzzle 132, (33/49)   Diff: 6/95.4663
 -  Step-by-step instructions for solving  Puzzle 133, (33/49)   Diff: 6/46.5792
 -  Step-by-step instructions for solving  Puzzle 134, (37/49)   Diff: 6/43.6893
 -  Step-by-step instructions for solving  Puzzle 135, (38/49)   Diff: 6/55.7588
 -  Step-by-step instructions for solving  Puzzle 136, (39/49)   Diff: 8/6455.3565