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The Rules of Sudoku

Sudoku is played on a 9×9 grid divided into nine 3×3 boxes. The goal is to fill every empty cell with a digit from 1 to 9 so that each row, each column, and each 3×3 box contains every digit exactly once, with no repeats anywhere. Every properly generated puzzle has exactly one valid solution that can be reached through pure logic — no guessing required, even at the hardest difficulty.

What makes Sudoku endlessly replayable is that the rules never change, but the starting grid always does. Each fresh puzzle presents a new logical puzzle to untangle, which is why the game has remained one of the most popular logic puzzles in the world for decades, appearing everywhere from newspapers to dedicated apps.

Core Solving Strategies

Most solvers start with "scanning" — looking at a row, column, or box and figuring out which digits are already placed nearby, then working out which empty cells can only logically hold one remaining digit. As a puzzle gets harder, scanning alone isn't enough, and that's where pencil-mark notes become essential: jotting down every digit that could still fit in a cell, then eliminating candidates one by one as more of the grid fills in.

More advanced techniques — like spotting a "naked pair" (two cells in the same row, column, or box that can only hold the same two candidate digits, letting you eliminate those digits from every other cell in that group) — let experienced players crack Hard and Expert puzzles without ever needing to guess. If you get stuck, a built-in hint reveals a single logical next step without spoiling the rest of the grid.

Difficulty Levels and the Daily Challenge

Four difficulty levels are available, from a gentle Easy grid with plenty of given numbers to a demanding Expert grid that leaves far fewer clues and requires chaining together multiple logical deductions. New players should start on Easy or Medium to build up pattern recognition before tackling Hard puzzles, where notes mode becomes almost essential rather than optional.

The daily challenge gives every player, guest or signed-in, the exact same puzzle each day — a fun way to compare notes and times with friends, since everyone is solving the identical grid rather than a randomly generated one.

Why Sudoku Is Good for Your Brain

Sudoku is a pure logic puzzle: there's no vocabulary, math beyond counting to nine, or outside knowledge required, which is part of why it's played by people of every age and background worldwide. Regularly working through Sudoku puzzles exercises short-term memory, pattern recognition, and systematic elimination — the same kind of structured thinking useful in everyday problem-solving, all wrapped in a genuinely relaxing, screen-friendly format.

Playing on Mobile vs. Desktop

This Sudoku is built to feel equally natural on a touchscreen or with a mouse and keyboard. On mobile, tap a cell and then tap a number from the on-screen keypad; on desktop, click a cell and use your number keys for faster entry. Notes mode and the hint button work identically on both, so switching between your phone during a commute and your desktop at home never means relearning the controls or losing track of a puzzle in progress.