Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 29: Four Easy Sudoku-7C-2V Puzzles (numbers 157-160) 
 
-  Step-by-step instructions for solving  Puzzle 157, (28/49)   Diff: 4/9943
 -  Step-by-step instructions for solving  Puzzle 158, (30/49)   Diff: 4/9951
 -  Step-by-step instructions for solving  Puzzle 159, (30/49)   Diff: 4/9894
 -  Step-by-step instructions for solving  Puzzle 160, (30/49)   Diff: 4/9764