Sudoku
Puzzle
Play free sudoku online with three difficulty levels, pencil notes, and puzzles that always have exactly one solution. Whether you want a gentle warm-up or a hard grid that fights back, every board is generated fresh — no repeats, no downloads, and a timer to race your personal best.
▶ Play now — freeHow to play
Fill the 9×9 grid so every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. Tap a cell and choose a number, or use your keyboard. Toggle notes mode to pencil in candidates, and use up to three hints when a grid gets stubborn.
Tips & tricks
Scan for rows and boxes that already hold eight digits — the ninth is free. Work naked singles first, then use notes to track candidates in tight regions. If two cells in a box share the same two candidates, no other cell in that box can hold them — that pair unlocks more than you expect.