Sudoku rules: how to play
Sudoku is a logic puzzle on a 9×9 grid: fill every row, column and 3×3 box with the digits 1 to 9, each exactly once. It needs no arithmetic — only logic.
BN-games generates a fresh puzzle every game in three difficulty levels. Pencil marks, undo and redo are built in, and a hint shows the next logical step with an explanation, so it teaches the technique instead of just filling in a cell. It is free, needs no account, and is also available as an app for iOS and Android.
Rules
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. Some cells are filled with digits from 1 to 9; the rest are blank.
Your goal is to fill every blank cell so that each row, each column, and each 3×3 box contains the digits 1 through 9 exactly once. There is always a single unique solution that can be reached by pure logic — no guessing required.