Easy Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 6: Twelve Easy (DiffLev 4) Sudoku-12up Puzzles (numbers 37-48) 
 
-  Step-by-step instructions for solving  Puzzle 37, (53/144)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 38, (54/144)   Diff: 4/9951
 -  Step-by-step instructions for solving  Puzzle 39, (59/144)   Diff: 4/9964
 -  Step-by-step instructions for solving  Puzzle 40, (61/144)   Diff: 4/9932
 -  Step-by-step instructions for solving  Puzzle 41, (63/144)   Diff: 4/9993
 -  Step-by-step instructions for solving  Puzzle 42, (64/144)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 43, (65/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 44, (67/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 45, (67/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 46, (68/144)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 47, (69/144)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 48, (70/144)   Diff: 4/9991