Tournament Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 6: Twelve Tournament (DiffLev 26-29) Sudoku-12up Puzzles (numbers 37-48) 
 
-  Step-by-step instructions for solving  Puzzle 37, (91/144)   Diff: 26/94.222B.2B22.422A.2441.1148.9674
 -  Step-by-step instructions for solving  Puzzle 38, (92/144)   Diff: 27/624.12BA.121C.1A34.4444.4596.6552
 -  Step-by-step instructions for solving  Puzzle 39, (92/144)   Diff: 27/343.1111.11AC.1211.1D45.4665.6896
 -  Step-by-step instructions for solving  Puzzle 40, (93/144)   Diff: 27/742.3211.1334.2A13.5636.6636.4451
 -  Step-by-step instructions for solving  Puzzle 41, (94/144)   Diff: 27/664.2122.2B45.6743.3111.2455.2554
 -  Step-by-step instructions for solving  Puzzle 42, (87/144)   Diff: 28/921C.2211.221B.5522.3223.4225.8553
 -  Step-by-step instructions for solving  Puzzle 43, (89/144)   Diff: 29/4.1D1C.1A12.21A1.3223.B244.9443.6558
 -  Step-by-step instructions for solving  Puzzle 44, (93/144)   Diff: 29/4.4211.21B2.1111.12B2.5342.2656.9777
 -  Step-by-step instructions for solving  Puzzle 45, (94/144)   Diff: 29/8.6313.4331.243A.11A1.A242.3536.6259
 -  Step-by-step instructions for solving  Puzzle 46, (94/144)   Diff: 29/4.441B.1A11.1224.6553.1212.4345.5973
 -  Step-by-step instructions for solving  Puzzle 47, (95/144)   Diff: 29/4.2332.2123.3454.11C1.221B.3237.9963
 -  Step-by-step instructions for solving  Puzzle 48, (97/144)   Diff: 29/5.6732.11AA.1123.5111.12D2.1245.9993