Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 31: Three Easy HyperSudoku-Xtreme Puzzles (numbers 85-87) 
 
-  Step-by-step instructions for solving  Puzzle 85, (155/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 86, (164/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 87, (202/369)   Diff: 4/9993