Variations on Challenging Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 7: Eight Challenging HyperSudoku-Xtreme Puzzles (numbers 33-40) 
 
-  Step-by-step instructions for solving  Puzzle 33, (253/369)   Diff: 17/9.9999.7A32.2227.8541
 -  Step-by-step instructions for solving  Puzzle 34, (279/369)   Diff: 17/9.9999.9999.9999.9673
 -  Step-by-step instructions for solving  Puzzle 35, (280/369)   Diff: 17/9.9999.9999.9999.9932
 -  Step-by-step instructions for solving  Puzzle 36, (261/369)   Diff: 18/99.9999.7993.B344.6955
 -  Step-by-step instructions for solving  Puzzle 37, (274/369)   Diff: 19/999.9999.9925.9999.9543
 -  Step-by-step instructions for solving  Puzzle 38, (270/369)   Diff: 20/9999.9998.5999.9932.3584
 -  Step-by-step instructions for solving  Puzzle 39, (270/369)   Diff: 20/9999.9958.9999.9998.9632
 -  Step-by-step instructions for solving  Puzzle 40, (284/369)   Diff: 20/9999.9999.9999.9999.7562