Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 56: Eight Difficult Sudoku-8up Puzzles (numbers 325-332) 
 
-  Step-by-step instructions for solving  Puzzle 325, (41/64)   Diff: 9/4.3356.3773
 -  Step-by-step instructions for solving  Puzzle 326, (42/64)   Diff: 9/4.1125.6994
 -  Step-by-step instructions for solving  Puzzle 327, (43/64)   Diff: 9/7.5445.4365
 -  Step-by-step instructions for solving  Puzzle 328, (42/64)   Diff: 10/34.2324.5964
 -  Step-by-step instructions for solving  Puzzle 329, (45/64)   Diff: 11/433.2355.6653
 -  Step-by-step instructions for solving  Puzzle 330, (47/64)   Diff: 11/654.4433.3663
 -  Step-by-step instructions for solving  Puzzle 331, (42/64)   Diff: 12/6112.3242.4584
 -  Step-by-step instructions for solving  Puzzle 332, (46/64)   Diff: 12/3453.6236.5441