Square One: Daily Sudoku

Learn the logic behind every square with guided solving, a daily Sudoku, unlimited puzzles, and offline play - without ads or a Square One account.

Square One is a calm, beautifully focused Sudoku game that helps you understand the logic behind every square. No ads, no Square One account, and no analytics. Play entirely offline, or carry supported progress across your Apple devices with Game Center.

LEARN SUDOKU AS YOU PLAY

New to Sudoku—or ready to sharpen your solving?

• Start with a three-step illustrated field guide
• Tap Learn during a game to see a logical next step explained on your board
• Practise Naked Singles, Hidden Singles, Naked Pairs, and Box–Line reductions
• Track each technique as you move from New to Practising to Reliable
• Reveal a square only when you choose

DAILY SUDOKU CHALLENGE

Everyone gets the same daily Sudoku board. Solve it, build your streak, and come back tomorrow. A live countdown shows when the next daily puzzle drops, and completed boards can be reviewed afterward.

UNLIMITED FREE SUDOKU PUZZLES

Generate fresh Sudoku boards whenever you like across four difficulty levels: Easy for a quick warm-up, Medium and Hard for a proper challenge, and Expert for serious solvers. Every puzzle has a guaranteed unique solution.

BUILT FOR FOCUSED SOLVING

• Smart highlighting for rows, columns, boxes, and matching numbers
• Pencil marks that auto-clear as you place digits
• Pinch to zoom with precise cell selection
• Responsive controls for portrait, landscape, and compact layouts
• Undo, erase, board reset, manual checking, and three hints per game
• Haptic feedback, a pausable timer, live score, and light and dark themes
• Customisable highlights, controls, number input, and layout

PROGRESS THAT STICKS

• 28 achievements across milestones, streaks, difficulty, and mastery
• Daily streak tracking with current and best streaks
• Personal best times and scores at every level
• Lifetime totals, win rate, and average solve time
• Technique progress that grows as you learn and apply solving strategies
• Game Center achievements and cloud progress on supported Apple devices

PRIVATE BY DESIGN

Square One has no ads, no third-party analytics, and no account system of its own. The complete game works offline, with gameplay stored locally on your device. If you are signed in to Game Center, supported progress and achievements may sync through Apple services. Daily reminders are optional and scheduled locally on your phone.

Free Sudoku with room to think. Download Square One and start today’s puzzle.