Sue Doku

Visit the Tutorials tab for a complete list of tutorials, including: How to get the most out of this site; Rules of Sudoku; Techniques (from simple to advanced)!
Generate, Load, or Enter a puzzle in the Load tab.
Set your preferences in the Setting tab.
Use the Tools tab for helpful functions while you manually solve the puzzle, or use the Guided Solve tab to follow along as the computer shows you how to solve it.
To navigate on the board, hover over a cell (or use arrow keys to move from cell to cell.)
Enter Big or Small ("candidate") numbers in the cell however you set these functions up in the Settings tab (e.g. keyboard, numpad, or mouse.)
You can underline candidate numbers via the U (for Underline) key to indicate that a block owns the candidate on that row.
You can prime (') candidate numbers via the ' (double or single quote) key to indicate that a block owns the candidate on that column.
You can circle candidate numbers via the C (for Circle) key to indicate that the candidate appears exactly twice in that block.
As a shortcut you can hover over the 3x3 grid area of a cell and press one of the above keys to input both the number and the symbol at the same time.
The program will prevent you from entering a number that already exists in its house (by "house" we mean the row, column, and block a cell belongs to.) It will sound a warning tone and highlight a number that prevents your entry.
Free registration (from the Login tab) allows you to save your results and partially completed puzzles to resume later. It will also remember which puzzles you�ve done so you won�t see repeats.

ver. 1.01

Load a puzzle, generate a puzzle, or manually enter a puzzle on the board.

Generate a Random Sudoku Puzzle
Paste Sudoku Puzzle Text format here:
Manually enter the Givens for a Sudoku Puzzle

Shuffle/renumber puzzle

For logged-in users, any partially completed puzzles will appear below.

Note: Green buttons are "press-and-hold". Release to end, or slide-off to lock (then click to unlock.)

Show		For Numbers
Show
Big #s	Small #s	2/24	5/4	4/7	4/12	3/15	4/7	6/1	1/33	2/21
	Conj. Pairs
	BVCs

Prevent entry of incorrect Big Numbers.
Highlight House on Hover (press Enter to lock)




To solve a single cell, hover over the cell and press the S key.

Hide

Select Drawing Type

Line

Alt.

Can.

Alt.

Cell

Alt.

Locked

Auto Straighten Lines

Introduction
- How to use Sue to learn and play Sudoku (video)
- Sudoku Intro
Solving Techniques
- Very Easy Techniques
  - Cross-hatching
- Easy Techniques
- Medium Techniques
- Hard Techniques
- Very Hard Techniques
- Advanced Techniques
  - WXYZ-Wing
  - Sue de Coq
  - W-Wing
  - Fins & Sashimi
  - Empty Rectangles
  - Remote Pairs
  - Unique Techniques
- Very Advanced Techniques
  - Chaining
  - TDP

Set your preferences here.

Entering Numbers on the Board
Candidates ("Little Numbers")	Entry	Solutions ("Big Numbers")
	Keyboard
	Shift Keyboard
	Num Keypad
	Mouse

Mute all sounds
Skip Welcome Banner on startup
Skip Intro tab on startup
Show Summary after loading a puzzle
Prevent erasing of a candidate when it is the cell's solution

(Note: this uses cookies.)

Techniques to use for solving
Use	Level	Technique
Check All Uncheck All
	Very Easy	Cross-hatching
	Easy	Full House
	Easy	Single Possibilities
	Medium	Naked and Hidden Singles
	Medium	Locked Candidates
	Medium	Naked Pairs
	Medium	Hidden Pairs
	Hard	Naked Triples
	Hard	Hidden Triples
	Hard	X-Wing
	Hard	Skyscraper
	Hard	Two String Kite
	Very Hard	Naked Quads
	Very Hard	Hidden Quads
	Very Hard	XY-Wing
	Very Hard	XYZ-Wing
	Very Hard	Swordfish
	Advanced	WXYZ-Wing
	Advanced	Sue de Coq
	Advanced	W-Wing
	Advanced	Finned X-Wing
	Advanced	Finned Swordfish
	Advanced	Empty Rectangles
	Advanced	Remote Pairs
	Advanced	B.U.G.+1
	Advanced	Unique Rectangles
	Advanced	Avoidable Rectangles
	Very Advanced	Simple Coloring
	Very Advanced	X-Chain
	Very Advanced	XY-Chain
	Very Advanced	TDP

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