Medium Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 5: Twenty-Five Medium (DiffLev 7) Sudoku-by5 Puzzles (numbers 51-75) 
 
-  Step-by-step instructions for solving  Puzzle 51, (170/369)   Diff: 7/996.4653
 -  Step-by-step instructions for solving  Puzzle 52, (203/369)   Diff: 7/999.9943
 -  Step-by-step instructions for solving  Puzzle 53, (204/369)   Diff: 7/999.9853
 -  Step-by-step instructions for solving  Puzzle 54, (205/369)   Diff: 7/999.9541
 -  Step-by-step instructions for solving  Puzzle 55, (209/369)   Diff: 7/999.9451
 -  Step-by-step instructions for solving  Puzzle 56, (210/369)   Diff: 7/999.9643
 -  Step-by-step instructions for solving  Puzzle 57, (214/369)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 58, (214/369)   Diff: 7/999.9974
 -  Step-by-step instructions for solving  Puzzle 59, (216/369)   Diff: 7/999.9922
 -  Step-by-step instructions for solving  Puzzle 60, (218/369)   Diff: 7/999.9982
 -  Step-by-step instructions for solving  Puzzle 61, (219/369)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 62, (219/369)   Diff: 7/999.9971
 -  Step-by-step instructions for solving  Puzzle 63, (220/369)   Diff: 7/999.9962
 -  Step-by-step instructions for solving  Puzzle 64, (221/369)   Diff: 7/999.9991
 -  Step-by-step instructions for solving  Puzzle 65, (222/369)   Diff: 7/999.9992
 -  Step-by-step instructions for solving  Puzzle 66, (223/369)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 67, (227/369)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 68, (228/369)   Diff: 7/999.9981
 -  Step-by-step instructions for solving  Puzzle 69, (229/369)   Diff: 7/999.9993
 -  Step-by-step instructions for solving  Puzzle 70, (230/369)   Diff: 7/999.9992
 -  Step-by-step instructions for solving  Puzzle 71, (231/369)   Diff: 7/999.9991
 -  Step-by-step instructions for solving  Puzzle 72, (233/369)   Diff: 7/999.9992
 -  Step-by-step instructions for solving  Puzzle 73, (235/369)   Diff: 7/999.9997
 -  Step-by-step instructions for solving  Puzzle 74, (235/369)   Diff: 7/999.9994
 -  Step-by-step instructions for solving  Puzzle 75, (242/369)   Diff: 7/999.9992