Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 7: Eight Challenging Sudoku-7 Puzzles (numbers 25-32) 
 
-  Step-by-step instructions for solving  Puzzle 25, (36/49)   Diff: 13/2.1A12.A123.4891
 -  Step-by-step instructions for solving  Puzzle 26, (37/49)   Diff: 13/3.3322.1211.5662
 -  Step-by-step instructions for solving  Puzzle 27, (39/49)   Diff: 13/2.1344.4321.4461
 -  Step-by-step instructions for solving  Puzzle 28, (37/49)   Diff: 14/21.A112.2244.3653
 -  Step-by-step instructions for solving  Puzzle 29, (39/49)   Diff: 14/AA.1122.4434.1465
 -  Step-by-step instructions for solving  Puzzle 30, (39/49)   Diff: 14/11.1211.2112.6884
 -  Step-by-step instructions for solving  Puzzle 31, (41/49)   Diff: 14/32.2311.2134.5671
 -  Step-by-step instructions for solving  Puzzle 32, (41/49)   Diff: 14/21.2234.5433.2352