Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 10: Three Easy Sudoku-Xtreme Puzzles (numbers 22-24) 
 
-  Step-by-step instructions for solving  Puzzle 22, (128/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 23, (132/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 24, (144/369)   Diff: 3/991