Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 14: Six Difficult (DiffLev 12-14) tpsmith-surprised Puzzles (numbers 103-108) 
 
-  Step-by-step instructions for solving  Puzzle 103, (94/144)   Diff: 12/9544.5599.9994
 -  Step-by-step instructions for solving  Puzzle 104, (94/144)   Diff: 12/9434.5999.9991
 -  Step-by-step instructions for solving  Puzzle 105, (95/144)   Diff: 12/9997.8799.9541
 -  Step-by-step instructions for solving  Puzzle 106, (99/144)   Diff: 13/9.5458.8889.9991
 -  Step-by-step instructions for solving  Puzzle 107, (102/144)   Diff: 13/6.7674.7979.9994
 -  Step-by-step instructions for solving  Puzzle 108, (97/144)   Diff: 14/97.7445.6665.9962