Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 43: Two Difficult (DiffLev 11-13) Projectingly Puzzles (numbers 165-166) 
 
-  Step-by-step instructions for solving  Puzzle 165, (85/144)   Diff: 11/999.7565.6991
 -  Step-by-step instructions for solving  Puzzle 166, (86/144)   Diff: 13/9.9733.3579.7793