Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 43: Four Easiest Sudoku-8-X Puzzles (numbers 245-248) 
 
-  Step-by-step instructions for solving  Puzzle 245, (22/64)   Diff: 2/92
 -  Step-by-step instructions for solving  Puzzle 246, (22/64)   Diff: 2/92
 -  Step-by-step instructions for solving  Puzzle 247, (22/64)   Diff: 2/91
 -  Step-by-step instructions for solving  Puzzle 248, (22/64)   Diff: 2/91