Medium Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 6: Twelve Medium (DiffLev 7-8) Sudoku-12up Puzzles (numbers 37-48) 
 
-  Step-by-step instructions for solving  Puzzle 37, (73/144)   Diff: 7/999.7792
 -  Step-by-step instructions for solving  Puzzle 38, (75/144)   Diff: 7/999.9833
 -  Step-by-step instructions for solving  Puzzle 39, (77/144)   Diff: 7/989.9952
 -  Step-by-step instructions for solving  Puzzle 40, (78/144)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 41, (79/144)   Diff: 7/997.9994
 -  Step-by-step instructions for solving  Puzzle 42, (81/144)   Diff: 7/999.9972
 -  Step-by-step instructions for solving  Puzzle 43, (76/144)   Diff: 8/9999.8644
 -  Step-by-step instructions for solving  Puzzle 44, (79/144)   Diff: 8/9789.9982
 -  Step-by-step instructions for solving  Puzzle 45, (81/144)   Diff: 8/9999.9966
 -  Step-by-step instructions for solving  Puzzle 46, (81/144)   Diff: 8/9998.9962
 -  Step-by-step instructions for solving  Puzzle 47, (87/144)   Diff: 8/9999.7991
 -  Step-by-step instructions for solving  Puzzle 48, (89/144)   Diff: 8/6999.9992