# Sudoku Help - Guide Choice

If you would like help in learning the basics of Sudoku or using the Sudoku Dragon puzzle solver we have created a number of step by step guides.

The list gives a brief description of all the available guides, simply select the guide from the list and press **Start** or double click on the item.

Topics include :

- How to solve a puzzle with Sudoku Dragon.
- Marking possibilities with Sudoku Dragon.
- Solving a gentle 4x4 puzzle step by step.
- Solving a gentle 9x9 puzzle step by step.
- Solving a moderate 9x9 puzzle step by step.
- Solving a complete moderate 9x9 puzzle step by step using the 2 out of 3 strategy.
- Using the only square allocation rule.
- Using the only choice allocation rule.
- Using the naked twin exclusion rule.
- Using the excluded sub-group rule.
- Using the hidden twin exclusion rule.
- Using the hook rule.
- Using the naked chain rule.
- Using the naked triplet exclusion rule.
- Using the alternate pair allocation rule.
- Using the X-Wing exclusion rule.

- Index of available guides
- Only Choice rule for gentle puzzles
- Only Square rule for gentle puzzles
- Single Possibility rule for gentle puzzles
- Two out of Three strategy for gentle puzzles
- Shared Subgroup rule for gentle and moderate puzzles
- Naked Twin rule for moderate puzzles
- Hidden Twin rule for tough puzzles
- X Wing rule for tough puzzles
- Swordfish rule for tough puzzles
- Alternate Pair rule for very tough puzzles
- Hook rule for very tough puzzles
- Trial and error rule for any puzzle
- Solving a gentle puzzle step by step
- Gentle puzzle solved using Only Choice and Only Square
- Moderate puzzle solved using some Twin and Sub-group logic
- Challenging puzzle solved using Hook and Sub-group logic
- Running a Dragon Tutorial
**Choosing a Dragon Tutorial**

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