Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 45: Eight Medium Sudoku-8-X Puzzles (numbers 253-260) 
 
-  Step-by-step instructions for solving  Puzzle 253, (43/64)   Diff: 6/99.9743
 -  Step-by-step instructions for solving  Puzzle 254, (38/64)   Diff: 7/942.7441
 -  Step-by-step instructions for solving  Puzzle 255, (43/64)   Diff: 7/832.5696
 -  Step-by-step instructions for solving  Puzzle 256, (45/64)   Diff: 7/667.9762
 -  Step-by-step instructions for solving  Puzzle 257, (44/64)   Diff: 8/91B3.3694
 -  Step-by-step instructions for solving  Puzzle 258, (46/64)   Diff: 8/6556.6774
 -  Step-by-step instructions for solving  Puzzle 259, (48/64)   Diff: 8/6644.6697
 -  Step-by-step instructions for solving  Puzzle 260, (49/64)   Diff: 8/8725.3994