#### Today's Dragon Tip

Possibility coding
Our unique display grid not only shows you what allocations are possible for each square but also uses color coding to let you see immediately why an allocation is or is not possible.

# Sudoku puzzles

Learn all about Sudoku puzzles with our in-depth information about Sudoku, its fascinating origins, solution strategies (up to advanced level) and theory.

Let our animated guides take you step-by-step through the many and varied strategies for solving Sudokus.

Sudoku Dragon is a sophisticated program that generates and helps you solve Sudokus on your PC. It is free for you to download and try.

Every day we publish unique, free puzzles on this site (Standard, Word, Samurai and Jigsaw types) that can also be picked up automatically with your news reader. All our daily puzzles can also be downloaded directly by the Sudoku Dragon puzzle solver.

The program provides diagonal (or X-Sudoku), Samurai Sudoku, Word Sudoku, Jigsaw (or Squiggle) Sudoku and Samurai Sudoku puzzles. A unique variation of the basic puzzle is provided here, each Sudoku can include the Sudoku Stripe - which adds a new twist to solving Sudokus.

Click on this link to take a quick online tour of the Sudoku Dragon program: Tour starts here.
It gives easy to follow explanations of the possible allocations for squares. This includes the twin exclusion, X-Wing and alternate pair strategies. It lets you download new puzzles or generate new ones. It has a full range of display themes to select a full range of colors and styles. It helps you find a solution to that frustrating Sudoku puzzle using a battery of analysis options. You can undo and redo square allocations which are listed for easy recall of what has been allocated so far. You easily backtrack after following a false lead, setting everything back as it was. Try the software for free for 23 days. It supports a whole range of puzzle grid sizes from the very small 4x4; through the standard 9x9 to the formidable 16x16 and 20x20 puzzles.

Our message board forums is full of help and you can join for free and help out other puzzle solvers.

Today’s Quotation “ The bitter and the sweet come from the outside, the hard from within, from one's own efforts.”
Einstein (Out of My Later Years) 1950

Ever wondered about the origins of Sudoku? Discover the long history of Sudoku on our History page. Read more...