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Game Introduction

“Sudoku” is a classic number puzzle game where players fill a 9x9 grid with digits 1-9, ensuring each row, column, and 3x3 box contains all numbers exactly once. This logic-based brain teaser challenges players’ reasoning abilities and patience.

Gameplay Strategy

1. Start Simple: Look for cells with only one possible answer first; these are usually breakthrough points.
2. Elimination Method: Observe existing numbers in rows, columns, and boxes to eliminate impossible options.
3. Candidate Number Method: Mark possible numbers in empty cells to help with analysis and reasoning.
4. Find Hidden Singles: Look for numbers that can only be placed in one position within a row, column, or box.
5. Progressive Advancement: After filling in each number, re-analyze the entire board to find new breakthrough points.

How to Play

• Select Cell: Click on empty cells to select them.
• Input Numbers: Use keyboard number keys 1-9 or click on-screen number buttons to input.
• Delete Numbers: Press delete key or click on filled numbers again to clear them.
• Mark Candidates: Some versions allow marking multiple possible candidate numbers in cells.

Frequently Asked Questions

1. Q: How do I know if a Sudoku has a solution? A: Legal Sudoku puzzles should have a unique solution. If contradictions or multiple solutions appear, there might be issues with the puzzle design.
2. Q: What if I get stuck? A: Carefully check if filled numbers have errors, and use more advanced solving techniques like “naked pairs” or “hidden pairs.”
3. Q: Are there different difficulty levels? A: Usually divided into different difficulty levels like easy, medium, hard, and expert.
4. Q: Do I need to guess? A: Standard Sudoku should be solvable through pure logical reasoning without guessing.