Easy Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 5: Twenty-Five Easy (DiffLev 4) Sudoku-by5 Puzzles (numbers 51-75) 
 
-  Step-by-step instructions for solving  Puzzle 51, (144/369)   Diff: 4/9961
 -  Step-by-step instructions for solving  Puzzle 52, (147/369)   Diff: 4/9951
 -  Step-by-step instructions for solving  Puzzle 53, (155/369)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 54, (156/369)   Diff: 4/9942
 -  Step-by-step instructions for solving  Puzzle 55, (159/369)   Diff: 4/9974
 -  Step-by-step instructions for solving  Puzzle 56, (168/369)   Diff: 4/9994
 -  Step-by-step instructions for solving  Puzzle 57, (169/369)   Diff: 4/9942
 -  Step-by-step instructions for solving  Puzzle 58, (171/369)   Diff: 4/9972
 -  Step-by-step instructions for solving  Puzzle 59, (172/369)   Diff: 4/9971
 -  Step-by-step instructions for solving  Puzzle 60, (172/369)   Diff: 4/9962
 -  Step-by-step instructions for solving  Puzzle 61, (173/369)   Diff: 4/9993
 -  Step-by-step instructions for solving  Puzzle 62, (174/369)   Diff: 4/9993
 -  Step-by-step instructions for solving  Puzzle 63, (174/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 64, (174/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 65, (175/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 66, (176/369)   Diff: 4/9972
 -  Step-by-step instructions for solving  Puzzle 67, (177/369)   Diff: 4/9974
 -  Step-by-step instructions for solving  Puzzle 68, (183/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 69, (184/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 70, (187/369)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 71, (189/369)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 72, (192/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 73, (193/369)   Diff: 4/9992
 -  Step-by-step instructions for solving  Puzzle 74, (202/369)   Diff: 4/9995
 -  Step-by-step instructions for solving  Puzzle 75, (207/369)   Diff: 4/9993