Three ways to play:

CLASSIC SUDOKU
The timeless 9×9 grid. Fill every row, column, and 3×3 box with digits 1-9. Six difficulty levels from relaxing Easy puzzles to mind-bending Grandmaster challenges with just 22 given cells.

IRREGULAR SUDOKU
Same rules, different regions. Twenty handcrafted templates replace the standard 3×3 boxes with irregular shapes, creating fresh challenges that demand new strategies.

KILLER SUDOKU
Cage sums meet sudoku logic. Each dashed cage shows a target sum — use arithmetic and elimination together to solve puzzles that combine the best of sudoku and kakuro.

Features that keep you coming back:

– Daily Challenge — A new puzzle every day. Build a streak with a forgiving grace window that rewards consistency without punishing the occasional missed day.
– Monthly Trophy Wall — A calendar view of every puzzle you have completed. Watch your month fill up.
– Technique Trainer — Learn solving strategies step by step. Nine guided exercises teach Naked Singles, Hidden Singles, and Naked Pairs.
– Smart Hints — Tiered hints that teach, not just tell. Level 1 names the technique; Level 2 reveals the answer. Advanced players can tackle X-Wing, Swordfish, and XY-Wing patterns.
– Auto-Notes — Toggle automatic candidate population to speed up advanced play.
– Multi-Color Candidates — Long-press notes to color-tag candidates for chain analysis.
– Pencil Notes & Undo — Full note-taking and unlimited undo for thoughtful solving.
– Shareable Solve Card — Finished a tough puzzle? Share a branded result card with your time and difficulty.
– Dark Mode — Follows your system setting for comfortable play day or night.
– Accessibility — Colorblind-friendly themes (deuteranopia, tritanopia, monochrome) and adjustable font scale.
– Tablet Layout — Optimized side-by-side layout on iPad and Android tablets.

Six difficulty levels:
Easy, Medium, Hard, Expert, Master, and Grandmaster. Every puzzle has exactly one solution.

Built for your life:
– Offline-first. No internet connection required.
– No account needed. Your progress stays on your device.
– Auto-save. Close the app and resume right where you left off.

Two ways to enjoy:
– Free — All puzzles, all difficulties, all game modes. Ads between sessions.
– Sudoku Pro ($4.99 one-time) — Remove all ads and get unlimited hints. One purchase, forever.

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

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