Tournament Sudoku-by5 Logic Puzzles (Vol 1) 
 Chapter 4: Twenty Tournament (DiffLev 23-24) Sudoku-by5 Puzzles (numbers 21-40) 
 
-  Step-by-step instructions for solving  Puzzle 21, (238/369)   Diff: 23/999.9992.3446.6A12.2238.6444
 -  Step-by-step instructions for solving  Puzzle 22, (247/369)   Diff: 23/999.9999.9983.5348.91A2.4684
 -  Step-by-step instructions for solving  Puzzle 23, (262/369)   Diff: 23/999.9999.9999.9768.6569.9953
 -  Step-by-step instructions for solving  Puzzle 24, (263/369)   Diff: 23/998.9986.5799.9999.9937.5551
 -  Step-by-step instructions for solving  Puzzle 25, (247/369)   Diff: 24/9999.9984.3243.2689.9957.6691
 -  Step-by-step instructions for solving  Puzzle 26, (248/369)   Diff: 24/9999.9999.9772.3342.C245.2472
 -  Step-by-step instructions for solving  Puzzle 27, (252/369)   Diff: 24/9999.9999.9995.2334.2D55.6754
 -  Step-by-step instructions for solving  Puzzle 28, (257/369)   Diff: 24/9999.9997.7999.9679.4B31.2564
 -  Step-by-step instructions for solving  Puzzle 29, (258/369)   Diff: 24/9999.9999.9975.C458.9455.7542
 -  Step-by-step instructions for solving  Puzzle 30, (258/369)   Diff: 24/9999.5799.9999.9999.7648.6751
 -  Step-by-step instructions for solving  Puzzle 31, (260/369)   Diff: 24/9999.9799.9999.9996.6436.3453
 -  Step-by-step instructions for solving  Puzzle 32, (261/369)   Diff: 24/9999.9999.9999.4799.7988.7574
 -  Step-by-step instructions for solving  Puzzle 33, (261/369)   Diff: 24/9999.9999.9896.41A1.1222.6874
 -  Step-by-step instructions for solving  Puzzle 34, (262/369)   Diff: 24/9999.9999.9999.9999.6973.4373
 -  Step-by-step instructions for solving  Puzzle 35, (264/369)   Diff: 24/9999.9999.9999.9997.88C5.7833
 -  Step-by-step instructions for solving  Puzzle 36, (264/369)   Diff: 24/9999.9588.9986.5854.9999.9994
 -  Step-by-step instructions for solving  Puzzle 37, (266/369)   Diff: 24/9999.9999.9999.981B.1125.4532
 -  Step-by-step instructions for solving  Puzzle 38, (267/369)   Diff: 24/9958.9999.9999.9999.9613.4442
 -  Step-by-step instructions for solving  Puzzle 39, (268/369)   Diff: 24/9999.9999.9999.9999.9772.3383
 -  Step-by-step instructions for solving  Puzzle 40, (268/369)   Diff: 24/9999.7999.9999.9999.9999.8443