Challenging Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 5: Twelve Challenging (DiffLev 15-17) Sudoku-12up Puzzles (numbers 25-36) 
 
-  Step-by-step instructions for solving  Puzzle 25, (78/144)   Diff: 15/995.1323.3545.6563
 -  Step-by-step instructions for solving  Puzzle 26, (84/144)   Diff: 15/996.474C.5675.7342
 -  Step-by-step instructions for solving  Puzzle 27, (89/144)   Diff: 15/944.5855.6966.5782
 -  Step-by-step instructions for solving  Puzzle 28, (85/144)   Diff: 16/8663.7442.2445.8992
 -  Step-by-step instructions for solving  Puzzle 29, (86/144)   Diff: 16/9568.5735.2135.9632
 -  Step-by-step instructions for solving  Puzzle 30, (91/144)   Diff: 16/9644.8892.1C47.8576
 -  Step-by-step instructions for solving  Puzzle 31, (94/144)   Diff: 16/8734.4269.9623.5599
 -  Step-by-step instructions for solving  Puzzle 32, (81/144)   Diff: 17/9.4112.1B22.7699.6534
 -  Step-by-step instructions for solving  Puzzle 33, (85/144)   Diff: 17/8.5363.2343.4975.9642
 -  Step-by-step instructions for solving  Puzzle 34, (88/144)   Diff: 17/9.3475.6654.5225.5668
 -  Step-by-step instructions for solving  Puzzle 35, (89/144)   Diff: 17/9.7996.4322.1A37.7583
 -  Step-by-step instructions for solving  Puzzle 36, (91/144)   Diff: 17/5.4544.5566.5775.7754