Sudoku
How to play
Gameplay
Sudoku. Fill the nine-by-nine grid with the digits one to nine so that every row, every column and every three-by-three box contains each digit exactly once. The standard approach starts from the cells with the fewest candidates: settle the singles first, then look for digits that can only go in one cell of a box, and work outward. Harder puzzles generally require pencil marks to make progress at all.
Controls
Click a cell and type a digit, with backspace to clear it. A draft mode lets you note candidate digits in a cell so the reasoning can be tracked. Check flags cells that conflict with entries already made, hint reveals one correct cell, and reset clears everything you have entered.
FAQ
Is my puzzle progress saved if I close the page?
No - the grid only lives in the current page session, so finish the puzzle (or screenshot it) before leaving.
How do I try a digit without committing?
Use draft mode: it writes small candidate notes into the cell, and once you are sure you can overwrite them with the final digit.
Related articles
More games
The classic block-clearing game
Sink the enemy fleet before they sink yours.
Capture all enemy pieces; kings rule the board.
Light-cycle duel — outlast the AI without crashing into a trail.
Find your way through a randomly generated maze.
Classic Pong on canvas: move your paddle with mouse or arrow keys against the CPU.