Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 38: Four Easiest Sudoku-8 Puzzles (numbers 213-216) 
 
-  Step-by-step instructions for solving  Puzzle 213, (22/64)   Diff: 2/95
 -  Step-by-step instructions for solving  Puzzle 214, (22/64)   Diff: 2/94
 -  Step-by-step instructions for solving  Puzzle 215, (22/64)   Diff: 2/93
 -  Step-by-step instructions for solving  Puzzle 216, (22/64)   Diff: 2/93