Sudoku
Fill in the numbers so that each row and column has no duplicates.
Category
Puzzle
Rating
Price
100% Free
How to Play
Sudoku is a logic-based number puzzle that challenges your deductive reasoning skills. The goal is to fill a 9×9 grid with digits 1-9 so that each column, row, and 3×3 subgrid contains all digits exactly once.
The puzzle starts with some cells pre-filled (called "givens"). Your task is to determine which numbers belong in the empty cells through logical deduction. The key rule is that no number can repeat within any row, column, or 3×3 box.
This version features multiple difficulty levels, from easy puzzles perfect for beginners to expert challenges that will test even seasoned players. The interface includes helpful features like pencil marks for tracking possibilities.
Controls
- Click a cell - Select it
- Number keys 1-9 - Enter a number
- Shift + Number - Add/remove pencil mark (note)
- Backspace/Delete - Clear cell
- N - Toggle notes mode
Tips & Tricks
- 1Start by looking for numbers that only fit in one cell within a row, column, or box
- 2Use pencil marks to track possible numbers for each cell
- 3Focus on sections with the most given numbers first
- 4Look for pairs - two cells in a row/box that can only contain the same two numbers
- 5Take breaks if stuck - fresh eyes often spot what you missed
Frequently Asked Questions
Do I need to be good at math?
Not at all! Sudoku uses logic, not arithmetic. You could replace numbers with letters or symbols and solve it the same way.
Is every Sudoku solvable without guessing?
Yes, all properly constructed Sudoku puzzles can be solved through pure logic - no guessing required.
What's the difference between difficulties?
Easy puzzles require simple techniques and have more starting numbers. Hard puzzles need advanced strategies and provide fewer clues.
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