SudokuPrimer 51 - pop-quiz with an easy puzzle - see why each number is placed where it is
SudokuPrimer 61 - pop-quiz on an easy puzzle
SudokuPrimer 49 - pseudo-quiz - why does that number go there?
SudokuPrimer 44 - tips for solving an easy puzzle - Sudoku To Go vol 102
Cloned Boxes - A Sudoku Variant
Tutorial #46 More Tricks and Techniques. http://www.sudokuguy.com
Tutorial #50 Solving a hard puzzle from the beginning to the end
Sudoku Primer 139 - TidBits - Unique Rectangles or Ambiguity Rule
Solving a Tripod Sudoku Puzzle
Sudoku | medium to hard level | Catmei Tv
zetamath Sudoku Basics: Notation
Tutorial 49 Spotting is fun.
Sudoku Primer 297 - Using The Sudoku n-alike Technique
SudokuPrimer 65 - solving a hard puzzle - Sudoku To Go vol 103
Tutorial # 47 More tricks using logic.
SudokuPrimer 58 - pseudo-quiz solving a hard puzzle
Sudoku Primer 296 - Lining Up Twins and Triplets to Find Elusive Numbers
Sudoku tutorial #69. Amazing puzzle with lots to learn with a breakthrough point.
Lesson 6. Sudoku Rule of exclusion. 2 empty cells hint for small numbers.
Tutorial #52 You can use these tricks for harder puzzles.
