Easy Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 22: Two Easy (DiffLev 3-4) Considerably Puzzles (numbers 123-124) 
 
-  Step-by-step instructions for solving  Puzzle 123, (61/144)   Diff: 3/995
 -  Step-by-step instructions for solving  Puzzle 124, (57/144)   Diff: 4/9941