A relaxing classic.
Sudoku that respects your time, your eyes, and your data. From a kid's first 4×4 grid to expert 9×9.
Four ways to play.
From a child's first puzzle to the kind of grid that teaches you a new technique. Pick a preset or dial in your own.
Kids 4×4, Beginner ramp, Standard, Custom.
The Beginner tier holds your hand with helpers on; Standard runs Easy through Expert; Custom lets you set the clue count, technique ceiling, and intensity yourself.
- 4×4 Kids mode for first-time puzzlers — all helpers on.
- Three Beginner steps before tackling Standard.
- Custom: clues, max technique tier, intensity — three knobs.
- Every puzzle has exactly one solution, guaranteed.
Per-tile points, with medals.
Every correct fill scores immediately — faster placements earn more, and there's a finisher bonus on the last cell. Helpers shave the per-fill reward fairly, so they're useful without being exploitative.
- Time multiplier decays from 1.0 → 0.30 across the first minute.
- Score is locked once earned — Undo and Erase don't refund.
- Best-score tracking per difficulty.
The technique solver nudges, doesn't tell.
Stuck? Tap Hint and Fung Sudoku names the technique you can apply right now — Naked Single, Hidden Pair, X-Wing, all the way up to XYZ-Wing. The board is for you to fill.
- 11 human-style techniques across four tiers.
- A full How to Play tab with interactive walkthroughs.
- Pencil-mark drafts auto-clear from peer cells when you commit.
Light or Dark. Big screen or small.
Built natively for each platform — SwiftUI on iOS, Jetpack Compose on Android — and laid out for tablets so the board breathes instead of stretching. Pick Light, Dark, or follow the system; the change applies instantly without an app restart.
- iPhone (iOS 17+) and iPad in all four orientations.
- Android phones and tablets (API 26+).
- Per-device theme override or System default.
In your language, switched in a tap.
Pick the system language or override it from Settings. Right-to-left rendering for Arabic, native scripts everywhere.
No ads. No accounts. No tracking.
Fung Sudoku has never made a network request, and it never will. Your saved games live in a JSON file on your device. That's it.