Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 24: Four Easy Sudoku-7C Puzzles (numbers 125-128) 
 
-  Step-by-step instructions for solving  Puzzle 125, (24/49)   Diff: 3/952
 -  Step-by-step instructions for solving  Puzzle 126, (26/49)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 127, (31/49)   Diff: 4/9972
 -  Step-by-step instructions for solving  Puzzle 128, (34/49)   Diff: 4/8796