Medium Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 5: Twelve Medium (DiffLev 5-6) Sudoku-12up Puzzles (numbers 25-36) 
 
-  Step-by-step instructions for solving  Puzzle 25, (57/144)   Diff: 5/9.9853
 -  Step-by-step instructions for solving  Puzzle 26, (62/144)   Diff: 5/9.9942
 -  Step-by-step instructions for solving  Puzzle 27, (64/144)   Diff: 5/9.9445
 -  Step-by-step instructions for solving  Puzzle 28, (79/144)   Diff: 5/9.9994
 -  Step-by-step instructions for solving  Puzzle 29, (68/144)   Diff: 6/99.9865
 -  Step-by-step instructions for solving  Puzzle 30, (69/144)   Diff: 6/99.9791
 -  Step-by-step instructions for solving  Puzzle 31, (73/144)   Diff: 6/99.9742
 -  Step-by-step instructions for solving  Puzzle 32, (76/144)   Diff: 6/99.9991
 -  Step-by-step instructions for solving  Puzzle 33, (76/144)   Diff: 6/99.9867
 -  Step-by-step instructions for solving  Puzzle 34, (77/144)   Diff: 6/99.9961
 -  Step-by-step instructions for solving  Puzzle 35, (78/144)   Diff: 6/99.9993
 -  Step-by-step instructions for solving  Puzzle 36, (81/144)   Diff: 6/99.9992