# Learn how to solve Sudoku

There are a large number of ways of solving Sudoku puzzles. We have developed a complete set of free interactive guides to take you through each step of using all the key solution strategies.

- 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

Here are some example Sudoku puzzles that are solved step by step using a mix of the strategies.

- Gentle puzzle solved using the Two out of Three strategy
- 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

Sudoku Dragon offers the best range of features for both the newbie and expert. It will solve and generate puzzles of all sorts of sizes. Read more...

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