Variations on Easy Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 5: Eight Easy Education-Xtreme Puzzles (numbers 17-24) 
 
-  Step-by-step instructions for solving  Puzzle 17, (128/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 18, (132/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 19, (139/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 20, (142/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 21, (146/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 22, (153/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 23, (184/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 24, (197/369)   Diff: 4/9992