Variations on Easy Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 4: Eight Easy Sudoku-Xtreme Puzzles (numbers 9-16) 
 
-  Step-by-step instructions for solving  Puzzle 9, (119/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 10, (122/369)   Diff: 3/991
 -  Step-by-step instructions for solving  Puzzle 11, (140/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 12, (161/369)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 13, (168/369)   Diff: 3/994
 -  Step-by-step instructions for solving  Puzzle 14, (198/369)   Diff: 4/9994
 -  Step-by-step instructions for solving  Puzzle 15, (198/369)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 16, (202/369)   Diff: 4/9991