Sudoku by WizusLabs

Six difficulty levels. Three game modes. One daily challenge. Classic, irregular, and killer sudoku in your pocket — offline, no account, free to play.

The classic number puzzle, with room to grow. Sudoku by WizusLabs brings you eleven ways to play — three board sizes and eight sudoku variants — with six difficulty levels from Easy to Grandmaster, all playable offline with no account required.

Every Classic puzzle is solvable by logic alone. No guessing needed.

THREE BOARD SIZES

• CLASSIC — The original 9x9 grid. Fill every row, column, and 3x3 box with 1-9.
• Mini — Quick 6x6 puzzle. Five minutes.
• LARGE 12x12 — A bigger 12x12 grid. More space to think.

EIGHT SUDOKU VARIANTS

• IRREGULAR — Same rules, custom regions.
• X-SUDOKU — Diagonals must hold 1-9 too.
• WINDOKU — Four shaded boxes also hold 1-9.
• EVEN-ODD — Shaded cells take even or odd digits.
• THERMO — Digits rise along each thermometer.
• ARROW — Each circle equals the sum along its arrow.
• KILLER — Cage sums + sudoku logic.
• SANDWICH — Margin clues sum the digits between 1 and 9.

RELAXED MODE No fail, no clock — just the puzzle. A practice run is never written to your stats, streak, or best time, and you check your work when you choose instead of being corrected as you type.

LEARN AS YOU PLAY

• Technique Trainer — 57 guided exercises across Core Techniques and every variant. Naked and Hidden Singles, Naked and Hidden Pairs, Pointing Pairs, X-Wing, Swordfish, XY-Wing, plus Killer cage combinations and the Rule of 45.
• Variant rules — Every puzzle type explains its own rule before you start.
• Smart Hints — Tiered hints that teach, not just tell. Level one names the technique; level two reveals the answer.

FEATURES

• Daily Challenge — A new puzzle every day, a daily streak, and an archive to replay past dates.
• Monthly Trophy Wall — A calendar view of every puzzle you have completed.
• Achievements — Recognition that unlocks as your solving deepens.
• Auto-Notes — Automatic candidate population for advanced play.
• Multi-Color Candidates — Color-tag candidates for chain analysis.
• Digit Spotlight — Long-press a number to light up every cell and note using it.
• Pencil Notes, Undo and Redo — Full note-taking, step back and step forward again.
• Cell-First or Number-First input — Pick your input grammar, and mirror the controls for left-handed play.
• Shareable Solve Card — Share a result card with your time and difficulty.
• Themes — Follow your system light or dark setting, or choose Light or Dark yourself.
• Accessibility — Colorblind palettes (deuteranopia, tritanopia, monochrome), adjustable font scale, larger board digits, and three peer-highlight styles.
• Tablet Layout — Cards reflow into two columns on iPad.

SIX DIFFICULTY LEVELS Easy, Medium, Hard, Expert, Master and Grandmaster — down to 21 given cells at Grandmaster. Every puzzle has exactly one solution.

BUILT FOR YOUR LIFE

• Offline-first. No internet connection required to play.
• No account needed. Your progress stays on your device.
• Auto-save. Close the app and resume right where you left off.

THREE WAYS TO ENJOY

• Free — All puzzles, all difficulties, all game modes, ad-supported. Ads appear between puzzles, never during one.
• Sudoku Pro Yearly ($2.99/year auto-renewable) — Remove ads, unlimited hints. Cancel anytime.
• Sudoku Pro Lifetime ($9.99 one-time) — Same benefits, one payment, never expires.

A calm, focused puzzle experience. No pay walls blocking puzzles. Just you and the grid.

Privacy policy: https://wizuslabs.com/sudoku/privacy-policy Terms of Use (EULA): https://wizuslabs.com/sudoku/terms-of-use