Sudoku

About Sudoku

Sudoku is the world's favourite logic puzzle, and this version runs on that simple promise: no maths, no luck, just pure deduction. Every grid hands you a scatter of starting numbers and asks you to fill the rest so each row, column and box holds one to nine exactly once. It scales from gentle warm-ups to genuinely brutal grids, so a quick coffee-break solve and a long, brow-furrowing challenge live under the same roof. If you have ever chased that satisfying click of the final digit dropping into place, this is built for you.

Playing is refreshingly direct: click a cell to select it, then click a number or press 1 through 9 on your keyboard to place it. The goal is to complete the whole grid correctly to clear the level, and there is real pressure baked in — three wrong entries end your run, so guessing is punished and careful reasoning rewarded. Solving faster earns bigger bonuses, giving even easy grids a reason to push. Across 15 levels the difficulty climbs steadily, with earlier boards handing you plenty of givens and later ones stripping them away until every placement demands a proper chain of logic.

Lean on technique rather than trial and error: scan rows, columns and boxes to spot cells with only one possible digit, and pencil through candidates in your head before committing, since those three strikes matter. Chase the numbers that are nearly complete across the grid, and slow down on the hardest levels where a single rushed entry can cost the run. Progress saves automatically as you climb, and the speed bonuses make old levels worth replaying for a cleaner time. Sign in free to carry your progress across devices and land your name on the all-time top-15 leaderboard. It plays instantly in any modern browser on desktop or mobile — no download, no install, no account required to start.