Free puzzles · endless games
Sudoku online
A fresh puzzle every time, each with exactly one solution. Pick your level and start.
Keyboard: 1–9 to fill, N for notes, arrows to move, Backspace to erase.
Want visitors to stay longer?
Add a branded game to your website.
Simple games and quizzes keep people on your site and can collect leads. I build them into WordPress and custom websites.
Sudoku strategies
- Scan for singles: look at one number at a time and find the only square in a box where it can go.
- Use notes: pencil in the possible numbers for tricky squares, then look for a square with only one option left.
- Pairs: if two squares in a row can only be the same two numbers, no other square in that row can use them.
- Never guess: every puzzle here can be solved by logic alone.
Frequently asked questions
How do you play Sudoku?
Fill the 9 × 9 grid so that every row, every column and every 3 × 3 box contains the numbers 1 to 9 exactly once. Some numbers are given at the start; work out the rest by logic.
Does every puzzle have one solution?
Yes. Each puzzle is generated fresh and checked so it has exactly one solution, so you never need to guess.
What do the difficulty levels mean?
Easier puzzles start with more numbers filled in. Expert puzzles give the fewest clues and need more advanced techniques.
How do notes work?
Turn on Notes (or press N) and the numbers you enter become small pencil marks, so you can track the possible numbers for a square. Placing a number clears it from the notes in the same row, column and box.
Will I lose my game if I close the page?
No. Your puzzle is saved in this browser, so you can come back and carry on.
More free games
2048
Slide and merge numbered tiles to reach 2048. Keyboard and swipe controls, best score saved.
Snake
The classic snake game: eat, grow and don't bite your own tail. Plays on phones too.
Minesweeper
Clear the board without hitting a mine. Beginner, intermediate and expert boards, with flags.
Tic Tac Toe
Play noughts and crosses against the computer, easy or unbeatable, or with a friend.
Memory Match
Flip cards and find all the matching pairs in as few moves as you can. Three board sizes.
Typing Speed Test
Test your typing speed in words per minute, with accuracy, in 30, 60 or 120 seconds.