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
Tutorial #46 More Tricks and Techniques. http://www.sudokuguy.com
SudokuPrimer 49 - pseudo-quiz - why does that number go there?
Sudoku Primer 300 - Two Things About Diagonal Patterns
Sudoku | medium to hard level | Catmei Tv
Sudoku Primer 297 - Using The Sudoku n-alike Technique
Tutorial # 47 More tricks using logic.
SudokuPrimer 65 - solving a hard puzzle - Sudoku To Go vol 103
Sudoku Primer 296 - Lining Up Twins and Triplets to Find Elusive Numbers
zetamath Sudoku Basics: Notation
Tutorial #50 Solving a hard puzzle from the beginning to the end
Sudoku Primer 139 - TidBits - Unique Rectangles or Ambiguity Rule
SudokuPrimer 58 - pseudo-quiz solving a hard puzzle
Tutorial 49 Spotting is fun.
Sudoku Primer 145 - forget patterns! Part 1
Sudoku Primer 282 - Learn How to Spot and Use Identical Twins
Sudoku Primer 289 - Use Sharp Focus When You Get Stuck
Sudoku Primer 68 - pop-quiz solving a hard puzzle (sudoku hard how to solve)
Sudoku Primer 236 - A Sudoku Pop Quiz
