Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 24: Three Easy HyperSudoku-by5 Puzzles (numbers 64-66) 
 
-  Step-by-step instructions for solving  Puzzle 64, (117/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 65, (140/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 66, (177/369)   Diff: 4/9991