Sudoku Primer 249 - Tough Subscriber Request Puzzle
Sudoku Primer 246 - The Hard-to-Spot Opposite Pattern
Sudoku Primer 259 - the Gate Pattern (Subscriber Request)
Sudoku Primer 165 - The Powerful Sudoku Opposite Pattern & How To Use It
Sudoku Primer 204 - Finding Quintuplets & How to Find Other Number Groups
Sudoku Primer 230 - Subscriber Request - A Blast From the Past!
Sudoku Primer 239 - Getting through a hard spot, then two more
Sudoku Primer 193 - Sail Through the Rough Patches in an Expert Puzzle
Sudoku Primer 215 - Look For Simple Things
Sudoku Primer 225 - Three Techniques Together to Find a Hard Number
Sudoku Primer 224 - The Art of Sudoku Without Candidates
Sudoku Primer 244 - Subscriber Request
SudokuPrimer 27 - lotsa twins, tips for solving a hard puzzle
Sudoku Primer 257 - Another Expert Puzzle from Papp Publishing
SudokuPrimer 66 - solving a diabolical puzzle - Sudoku To Go vol 103
Sudoku Primer 238 - Solving a Woman's World "Challenging" sudoku Puzzle
Sudoku Primer 254 - Sudoku Pop Quiz
SudokuPrimer 69 - pseudo-quiz solving a diabolical puzzle (sudoku pro)
SudokuPrimer 43 - Two patterns and hidden patterns to master Sudoku puzzle solving
zetamath Sudoku Basics: Notation
