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Sudoku — Classic 9×9 Logic Puzzle
Classic logic. Refined interface.
Game settings
Difficulty
Unlock with ProHow to play
Rules
Fill the 9×9 grid so that every row, column, and 3×3 box contains the digits 1–9.
Tap a cell, then type or tap a number. Use Hint if you get stuck.
Conflicts are shown in red — no need to double-check.
Read up on this game
Strategy
Sudoku Strategy Guide: 7 Techniques Every Solver Should Know
A step-by-step Sudoku strategy guide — from naked singles to X-Wing — with clear examples for beginners and improving solvers.
Guide
The Best Logic Puzzle Games of All Time (and Where to Play Them Online)
From Nikoli's paper classics to modern browser reinterpretations, here are the logic games worth learning — and the ones we're building next.
Beginner
Sudoku Solving Techniques for Beginners
The three Sudoku techniques that solve most easy and medium puzzles. Skip the wall-of-jargon guides and start here.