Sudoku Guides, Techniques and Puzzle Collections

Welcome to the Sudoku2PDF Learning Center. Here you'll find tutorials for beginners, explanations of solving techniques, printable puzzle collections, unusual Sudoku patterns, our puzzle rating system, and articles about the history and mathematics of Sudoku. Whether you want to improve your solving skills or simply discover interesting puzzles, this section is regularly updated with new articles.

Getting Started

The glossary of Sudoku terms used on this website

Interesting Sudoku Puzzles

Unusual Sudoku Puzzles with Amazing Patterns

About sudoku2pdf

Explore the following articles to learn about sudoku2pdf:

Where do our sudoku grids comme from? You will find here the sources of our Sudoku puzzles
Discover our Sudoku puzzle rating system (similar to the Elo rating in chess)

Useful Sudoku Resources

Official and reference resources

World Puzzle Federation (WPF): information about the World Sudoku Championship and international competitions. See also their Facebook Page.
Nikoli: the Japanese publisher that popularized Sudoku.

Communities

r/sudoku (Reddit): one of the largest online Sudoku communities.
Enjoy Sudoku Forum: a long-standing forum with many discussions on advanced solving and puzzle construction.