Difficult Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 8: Twenty Difficult (DiffLev 14) Sudoku-by5 Puzzles (numbers 81-100) 
 
-  Step-by-step instructions for solving  Puzzle 81, (239/369)   Diff: 14/99.9999.9999.5782
 -  Step-by-step instructions for solving  Puzzle 82, (244/369)   Diff: 14/99.9999.9999.5573
 -  Step-by-step instructions for solving  Puzzle 83, (244/369)   Diff: 14/99.9999.9979.8644
 -  Step-by-step instructions for solving  Puzzle 84, (244/369)   Diff: 14/99.9999.9938.9981
 -  Step-by-step instructions for solving  Puzzle 85, (246/369)   Diff: 14/99.9999.9999.9952
 -  Step-by-step instructions for solving  Puzzle 86, (246/369)   Diff: 14/99.9999.9999.9932
 -  Step-by-step instructions for solving  Puzzle 87, (247/369)   Diff: 14/99.9999.9999.9862
 -  Step-by-step instructions for solving  Puzzle 88, (247/369)   Diff: 14/99.9999.9999.8541
 -  Step-by-step instructions for solving  Puzzle 89, (248/369)   Diff: 14/99.7999.9999.9962
 -  Step-by-step instructions for solving  Puzzle 90, (249/369)   Diff: 14/99.9999.9999.9996
 -  Step-by-step instructions for solving  Puzzle 91, (252/369)   Diff: 14/99.9999.9999.9997
 -  Step-by-step instructions for solving  Puzzle 92, (252/369)   Diff: 14/99.9999.9999.6432
 -  Step-by-step instructions for solving  Puzzle 93, (254/369)   Diff: 14/99.9999.9999.9965
 -  Step-by-step instructions for solving  Puzzle 94, (254/369)   Diff: 14/99.9999.9999.9963
 -  Step-by-step instructions for solving  Puzzle 95, (256/369)   Diff: 14/99.9999.9999.9793
 -  Step-by-step instructions for solving  Puzzle 96, (256/369)   Diff: 14/99.9999.9999.8984
 -  Step-by-step instructions for solving  Puzzle 97, (257/369)   Diff: 14/99.9999.9999.9994
 -  Step-by-step instructions for solving  Puzzle 98, (257/369)   Diff: 14/99.9999.9999.9991
 -  Step-by-step instructions for solving  Puzzle 99, (261/369)   Diff: 14/99.9999.9999.9993
 -  Step-by-step instructions for solving  Puzzle 100, (266/369)   Diff: 14/99.9999.9999.9998