Easy Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 8: Twelve Easy (DiffLev 4) HyperSudoku-12 Puzzles (numbers 61-72) 
 
-  Step-by-step instructions for solving  Puzzle 61, (64/144)   Diff: 4/9981
 -  Step-by-step instructions for solving  Puzzle 62, (66/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 63, (66/144)   Diff: 4/9983
 -  Step-by-step instructions for solving  Puzzle 64, (66/144)   Diff: 4/9981
 -  Step-by-step instructions for solving  Puzzle 65, (69/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 66, (71/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 67, (72/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 68, (74/144)   Diff: 4/9994
 -  Step-by-step instructions for solving  Puzzle 69, (75/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 70, (75/144)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 71, (75/144)   Diff: 4/9974
 -  Step-by-step instructions for solving  Puzzle 72, (81/144)   Diff: 4/9991