Challenging Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 14: Six Challenging (DiffLev 18-20) tpsmith-surprised Puzzles (numbers 103-108) 
 
-  Step-by-step instructions for solving  Puzzle 103, (92/144)   Diff: 18/96.3131.1A16.7677.8964
 -  Step-by-step instructions for solving  Puzzle 104, (96/144)   Diff: 19/973.3426.4121.1388.7993
 -  Step-by-step instructions for solving  Puzzle 105, (103/144)   Diff: 19/555.4546.6336.9976.4466
 -  Step-by-step instructions for solving  Puzzle 106, (94/144)   Diff: 20/9656.5324.4225.6543.6592
 -  Step-by-step instructions for solving  Puzzle 107, (95/144)   Diff: 20/9563.1235.4333.3855.2698
 -  Step-by-step instructions for solving  Puzzle 108, (103/144)   Diff: 20/4643.4333.3335.7889.9634