Play Sudoku Online - Free, No Sign-up

Puzzle Temple's Sudoku is a classic 9x9 Sudoku that runs right in your browser, on a phone, a tablet or a computer. There is nothing to download and no account to create: pick a difficulty and start solving. Every puzzle is generated on the spot, so there is always a fresh grid waiting.

Five difficulty levels

Choose Easy, Medium, Hard, Expert or Extreme. The harder the level, the fewer numbers you are given at the start, so you need more careful reasoning and fewer lucky guesses. Easy is a gentle way to learn how rows, columns and 3x3 boxes work together; Extreme is for solvers who enjoy a long, quiet struggle with a nearly empty grid.

Tools that help you solve

• Notes let you jot candidate digits in a cell without committing, the way you would with a pencil.
• Hints fill in one correct cell when you are stuck (three per puzzle).
• Undo and Erase take back moves, so trying an idea costs nothing.
• Pause, restart and a timer keep track of how long a solve takes, and you can play with the number pad or the keyboard (digits and arrow keys).

Tips for solving faster

Start with the rows, columns and boxes that already hold the most numbers: they leave the fewest possibilities. Look for a digit that can only go in one cell of a box. When two cells in a row can only be the same two digits, no other cell in that row can use them. Notes make these patterns easy to spot. Three wrong digits end the game, so use a hint or a note rather than guessing.

Want the full method? Read how to play Sudoku, the techniques behind each level and how to use notes.

Compete on the leaderboard

You can play as a guest. Create a free account and verify your email to put your best times on the leaderboard for each difficulty, with boards for this week and for all time.

More puzzles

Want a faster challenge? Try Climb Sudoku, where every square has a countdown. Prefer something more relaxed, or to play with friends? Build an online jigsaw puzzle together.

How to Play

Fill the 9x9 grid so every row, every column, and every 3x3 box contains each digit 1 through 9 exactly once - no repeats anywhere.