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| About the Author | |
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| About the Technical Reviewer | |
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| Acknowledgments | |
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| Introduction | |
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| What Is Sudoku? | |
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| Rules of Sudoku | |
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| Sudoku Terminology | |
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| It's Just Logic! | |
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| Variants of Sudoku | |
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| Let's Play Sudoku! | |
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| Summary | |
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| Creating the Sudoku Application | |
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| Creating the Sudoku Project | |
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| Creating the User Interface | |
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| Declaring the Member Variables | |
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| Representing Values in the Grid | |
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| Generating the Grid Dynamically | |
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| Starting a New Game | |
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| Selecting the Numbers to Insert | |
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| Handling Click Events on the Label Controls | |
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| Undoing and Redoing a Move | |
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| Saving a Game | |
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| Opening a Saved Game | |
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| Ending the Game | |
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| Testing the Application | |
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| Summary | |
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| Basic Sudoku Solving Technique | |
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| Elimination Technique | |
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| Column, Row, and Minigrid Elimination | |
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| Usefulness of the CRME Technique | |
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| Exception Scenarios | |
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| Implementing the CRME Technique | |
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| Adding Member Variables | |
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| Modifying the SetCell() Subroutine | |
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| Adding a ToolTip Control | |
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| Calculating the Possible Values for a Cell | |
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| Scanning the Grid | |
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| Wiring the Controls | |
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| Testing It Out | |
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| Summary | |
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| Intermediate Techniques | |
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| Lone Rangers | |
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| Lone Rangers in a Minigrid | |
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| Lone Rangers in a Row | |
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| Lone Rangers in a Column | |
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| Implementing the Technique | |
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| Looking for Lone Rangers in Minigrids | |
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| Looking for Lone Rangers in Rows | |
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| Looking for Lone Rangers in Columns | |
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| Modifying the SolvePuzzle() Function | |
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| Testing Out the Lone Ranger Technique | |
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| Example 1 | |
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| Example 2 | |
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| Summary | |
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| Advanced Techniques | |
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| Looking for Twins | |
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| Looking for Triplets | |
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| Variants of Triplets | |
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| Brute-Force Elimination | |
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| Implementing the Techniques | |
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| Looking for Twins in Minigrids | |
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| Looking for Twins in Rows | |
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| Looking for Twins in Columns | |
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| Looking for Triplets in Minigrids | |
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| Looking for Triplets in Rows | |
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| Looking for Triplets in Columns | |
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| Modifying the SolvePuzzle() Function | |
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| Using Brute-Force Elimination | |
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| Modifying the Code Behind for the Solve Puzzle Button | |
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| Testing the Techniques | |
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| Summary | |
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| Generating Sudoku Puzzles | |
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| Determining the Level of Difficulty | |
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| Steps to Generate a Sudoku Puzzle | |
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| Determining the Locations of Empty Cells | |
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| Single-Solution Puzzles | |
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| Implementing the Puzzle-Generating Algorithm | |
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| Creating the Class | |
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| Randomizing the List of Possible Values | |
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| Generating a New Puzzle | |
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| Creating Empty Cells in the Grid | |
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| Vacating Another Pair of Cells | |
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| Exposing the GetPuzzle() Function | |
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| Wiring Up the Logic with the User Interface | |
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| Testing the Implementation | |
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| Easy Puzzles | |
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| Medium Puzzles | |
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| Difficult Puzzles | |
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| Extremely Difficult Puzzles | |
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| Summary | |
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| How to Play Kakuro | |
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| The Rules | |
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| Solving a Kakuro Puzzle | |
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| Tips for Solving Kakuro Puzzles | |
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| Summary | |
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| The SudokuPuzzle Class | |
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| Index | |