Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 25: Two Difficult (DiffLev 12-14) Exhaustingly Puzzles (numbers 129-130) 
 
-  Step-by-step instructions for solving  Puzzle 129, (86/144)   Diff: 12/9645.8999.6753
 -  Step-by-step instructions for solving  Puzzle 130, (86/144)   Diff: 14/95.4233.5799.9873