馃搵 Sudoku Rules Guide
Master the fundamentals of Sudoku so you can solve with confidence.
馃幆 Puzzle Objective
The goal of Sudoku is to fill a 9脳9 grid with digits 1鈥? so that each row, column, and 3脳3 subgrid contains every number exactly once.
Example Grid
馃搹 Core Rules
Row Rule
Each row must include the digits 1鈥? with no repeats.
Column Rule
Each column must also contain the digits 1鈥? exactly once.
馃幃 How to Play
Select a Cell
Click the square you want to fill. The selected cell will highlight.
Enter a Number
Use the number buttons or your keyboard to place digits 1鈥?.
Use Tools
Switch on notes to pencil in candidates, or tap the hint button when you're stuck.
Complete the Grid
Fill every cell correctly to finish the puzzle and celebrate the win!
鈿狅笍 Mistake Handling
Error Highlighting
Incorrect entries are highlighted in red so you can fix them quickly.
Undo Button
Use Undo to rewind your last move and recover from a mistake.
馃幆 Difficulty Levels
Easy
Perfect for newcomers with generous clues and straightforward logic.
Medium
A balanced experience that reinforces core solving skills.
Hard
Introduces advanced tactics like lone singles and hidden pairs.
Expert
Demands layered strategies and precise reasoning throughout.
Master
Extreme logic puzzles for veteran solvers seeking a serious challenge.
Extreme
Ultimate difficulty designed to test the limits of Sudoku knowledge.
馃搫 Page Overview
This rules guide from SudokuFun.org introduces every core aspect of Sudoku: the puzzle objective, row/column/box rules, step-by-step gameplay, mistake management, and difficulty tiers. With illustrated examples and approachable language, it's the ideal starting point for new players and a handy refresher for returning solvers.