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The goal is to fill a 9×9 grid with digits from 1 to 9 so that each digit appears exactly once in every row, column, and 3×3 box. Some cells are pre-filled — these are your starting clues.
Begin with cells that have the most filled neighbors: fewer options make it easier to identify the correct digit. As cells are filled in, the choices for adjacent ones narrow down — the puzzle unfolds as a chain of logical steps.
Use the notes mode to write down multiple candidates in a cell and eliminate them as the grid fills up. This is especially useful at Hard and Expert levels.
Additional modes come with extra rules. In X-Sudoku, digits must also be unique along both main diagonals. In Windoku, extra highlighted regions apply the same uniqueness rule. In Killer Sudoku, groups of cells must add up to a given sum. In Kropki, markers between cells define relationships: a white dot means the two digits differ by 1, a black dot means one is exactly twice the other.
Train your mind!
Sudoku Online is a free sudoku game that you can play instantly in the browser, without registering. You complete a nine by nine board using the numbers one through nine, with no number repeated in any row, column or smaller three by three square.
Standard play comes in four settings, from gentle puzzles for newcomers up to very demanding ones for experts. Variant modes change the rules: one adds the two diagonals, another adds bonus regions, one asks marked groups to add up to a given total and another places dots between adjacent cells.
Some cells are already filled as starting clues. Work first on squares surrounded by many given numbers, because fewer candidates remain there. Each solved cell narrows the options elsewhere. The game works on desktop and mobile, and it is a classic way to train logic and concentration.
Liked it? Try Mahjong Unlimited, 2048 checkers or Chess Royale next.
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Sudoku Online is a free sudoku game that you can play instantly in the browser, without registering. You complete a nine by nine board using the numbers one through nine, with no number repeated in any row, column or smaller three by three square.
Standard play comes in four settings, from gentle puzzles for newcomers up to very demanding ones for experts. Variant modes change the rules: one adds the two diagonals, another adds bonus regions, one asks marked groups to add up to a given total and another places dots between adjacent cells.
Some cells are already filled as starting clues. Work first on squares surrounded by many given numbers, because fewer candidates remain there. Each solved cell narrows the options elsewhere. The game works on desktop and mobile, and it is a classic way to train logic and concentration.
Liked it? Try Mahjong Unlimited, 2048 checkers or Chess Royale next.
The goal is to fill a 9×9 grid with digits from 1 to 9 so that each digit appears exactly once in every row, column, and 3×3 box. Some cells are pre-filled — these are your starting clues.
Begin with cells that have the most filled neighbors: fewer options make it easier to identify the correct digit. As cells are filled in, the choices for adjacent ones narrow down — the puzzle unfolds as a chain of logical steps.
Use the notes mode to write down multiple candidates in a cell and eliminate them as the grid fills up. This is especially useful at Hard and Expert levels.
Additional modes come with extra rules. In X-Sudoku, digits must also be unique along both main diagonals. In Windoku, extra highlighted regions apply the same uniqueness rule. In Killer Sudoku, groups of cells must add up to a given sum. In Kropki, markers between cells define relationships: a white dot means the two digits differ by 1, a black dot means one is exactly twice the other.
Train your mind!
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