Sudoku Primer 80 - ambiguity rule in a hard puzzle - Sudoku To Go vol 104 (sudoku tips and tricks)
Sudoku Primer 95 - pop-quiz solving hard puzzle #80 - Sudoku To Go vol 106 (sudoku lessons)
Sudoku Primer Sudoku Grand Prix Puzzle (Smart Hobbies Collaboration)
Sudoku Primer 281 - How to Solve “The Mole 1” Without Pencil Marks – Sudoku Primer Collaboration
Sudoku Primer 211 - Dell Challenger Puzzle Solved Using Four Patterns
Sudoku Primer 81 - in-depth look at L patterns (sudoku patterns)
Sudoku Primer 78 - in-depth look at loner cells (sudoku benefits)
Sudoku Primer 82 - pop-quiz solving a diabolical puzzle (sudoku tricks)
This Sudoku Trick Can Solve VERY Hard Puzzles – SHC 280
Sudoku Primer 101 - pop quiz solving a medium puzzle (using some harder techniques)
Sudoku Primer 323 - Techniques Make a Hard Puzzle Easier
Sudoku Tutorial #85 Solving a DIABOLICAL PUZZLE.
Sudoku Primer 150 - the diagonal pattern
SudokuPrimer 72 - speed-scanning - quickly find numbers in a hard puzzle (sudoku speed solving)
Sudoku Primer 263 - A Unique Way to Look At Unique Rectangles
Sudoku Primer 108 Using two tricks to break through a diabolical puzzle
SudokuPrimer 35 - tips for solving a diabolical puzzle - Sudoku To Go vol 101
SudokuPrimer 31 - patterns, patterns, patterns
Sudoku Primer 163 - Sudoku Pop Quiz (with Unique Rectangles)
Sudoku Was Hard Until I Understood These 7 Concepts
