Variations on Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 23: Three Perplexing Education-Xtreme Puzzles (numbers 61-63) 
 
-  Step-by-step instructions for solving  Puzzle 61, (271/369)   Diff: 51/975.6797.5746.594D.1311.2744.3578.2C78.9999+
 -  Step-by-step instructions for solving  Puzzle 62, (278/369)   Diff: 57/8.6111.2224.7349.9993.1334.5979.9431.2AA2+
 -  Step-by-step instructions for solving  Puzzle 63, (276/369)   Diff: 58/94.2B23.6899.8994.3111.1333.1111.4653.53C8+