Sudoku
Play free Sudoku online. A new puzzle is generated every round, with a unique solution, across three difficulty levels. No download, no sign-up.
How to Play
- Pick a difficulty: Easy, Medium, or Hard.
- Tap an empty cell, then tap a number (or press 1-9 on your keyboard) to fill it in.
- Every row, column, and 3x3 box must contain the digits 1 through 9 with no repeats.
- A number that conflicts with the rules is highlighted immediately.
- Fill the entire grid correctly to solve the puzzle.
Game Features
- A genuinely new puzzle is generated for every round, not a fixed set.
- Three difficulty levels, based on how many starting numbers are given.
- Real-time conflict highlighting when a number breaks the rules.
- Timer with a personal best saved on your device, per difficulty.
- On-screen number pad for mobile, plus full keyboard support on desktop.
- No login, no download. Play instantly.
Tips & Strategy
- Start with the rows, columns, and boxes that already have the most numbers filled in.
- Look for cells where only one number is possible before guessing between multiple options.
- Work through each 3x3 box systematically rather than jumping around the grid.
Frequently Asked Questions
What are the rules of Sudoku?
Fill the 9x9 grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 exactly once, with no repeats.
Can I get hints?
There's no direct hint button, but conflicting numbers are highlighted immediately so you always know when something needs fixing.
How many difficulty levels are there?
Three: Easy, Medium, and Hard, based on how many numbers are already filled in when the puzzle starts.
Does it check for mistakes?
Yes. Any number that conflicts with another in its row, column, or box is highlighted right away.
Can I play on mobile?
Yes. Tap a cell, then tap a number on the on-screen keypad.
Does it save my best time?
Yes. Your fastest solve time is saved on your device, separately for each difficulty.