Play classic Sudoku in your browser. Fill the 9x9 grid so every row, column and box holds 1-9. Three difficulties, notes, hints, undo. Free, no install.
Tap a cell, then tap a number to fill it. Turn on Notes for pencil marks. Use Erase, Undo and Hint. Fill every cell correctly to win.
Sudoku is the number puzzle that conquered the world without using a single equation. Despite the Japanese name, the modern form was designed by an American, Howard Garns, in 1979 under the title Number Place. It was a Japanese publisher that renamed it Sudoku, and a New Zealand judge who built the first automatic generator — which is exactly the kind of program that powers this game.
The board is a 9x9 grid split into nine 3x3 boxes. Some cells are filled in for you; the rest are blank. The single rule is this: every row, every column and every 3x3 box must contain the digits 1 through 9 exactly once.
There is no arithmetic and no guessing in a well-made puzzle. Each Sudoku here is generated with a guaranteed unique solution, so every digit can be reasoned out from the ones already placed. It is pure logic, and that purity is why it has stayed in newspapers and on phones for decades.
Fill every empty cell of the 9x9 grid so that each row, each column and each 3x3 box contains the digits 1 to 9 with no repeats. Tap a cell, then tap a number to place it.
Notes mode lets you pencil small candidate digits into a cell instead of committing to a final answer. It is how most solvers track which numbers are still possible in each cell.
Yes. Every Sudoku here is generated and checked so that it has exactly one valid solution. You never need to guess — every digit can be deduced.
Red means that digit conflicts with another cell — the same number already appears in its row, column or box. Sudoku does not allow repeats, so you will need to change it.
Hint fills one cell with its correct value from the solution. Use it when you are truly stuck, or to check that you are on the right track.
Easier puzzles start with more given numbers, which means more footholds for your logic. Harder puzzles give you fewer, so each deduction takes more careful reasoning.
Each puzzle gives you two free hints; after that every hint costs coins. You earn coins by solving puzzles — harder boards and faster, hint-light solves pay the most — and your coin balance is saved on this device.