Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 10: Six Difficult (DiffLev 12-14) tpsmith Puzzles (numbers 79-84) 
 
-  Step-by-step instructions for solving  Puzzle 79, (92/144)   Diff: 12/9884.3699.9575
 -  Step-by-step instructions for solving  Puzzle 80, (96/144)   Diff: 12/9965.5999.8762
 -  Step-by-step instructions for solving  Puzzle 81, (101/144)   Diff: 12/9999.8679.9691
 -  Step-by-step instructions for solving  Puzzle 82, (89/144)   Diff: 14/96.7467.5752.5676
 -  Step-by-step instructions for solving  Puzzle 83, (94/144)   Diff: 14/99.5999.3354.5744
 -  Step-by-step instructions for solving  Puzzle 84, (100/144)   Diff: 14/89.8547.7446.9994