Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 17: Three Easy Education-Xtreme Puzzles (numbers 43-45) 
 
-  Step-by-step instructions for solving  Puzzle 43, (150/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 44, (182/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 45, (193/369)   Diff: 4/9992