NineGrid: Sudoku Puzzles

Classic sudoku with four difficulty levels, smart pencil marks, and a daily puzzle. Works offline — data stays on your device.

NineGrid is a calm, offline sudoku game that lives right in your browser toolbar. Four difficulty levels — Easy, Medium, Hard, and Expert — each with puzzles that always have exactly one solution. There's also a fresh daily puzzle to keep a streak going. Features: - Smart pencil marks that clean themselves up as you place digits - Peer and same-number highlighting so the grid is easy to read - Undo, erase, and a gentle hint when you're stuck - A 3-mistake limit with a calm "take a breath" moment instead of a harsh game over - Personal records for your fastest solve at each level, plus finished and perfect-game counts - Light and dark themes - A full-screen mode for a bigger, two-column board - Full keyboard play — arrow keys to move, 1–9 to fill, and shortcuts for pencil, undo, and hint Everything runs offline. Your games, settings, and records stay on your device — nothing is sent anywhere, and no account is required. Open the toolbar icon and start a puzzle in one click.