Sudoku, from 4×4 to 16×16.
A clean, fast Sudoku. Warm up on a 4×4, settle into the classic 9×9, or take on a 16×16 hex grid. Every puzzle generated fresh with exactly one solution.
Pick a quick 4×4 to warm up or take on a brain-melting 16×16. Every board is generated fresh with exactly one solution — no repeats, no waiting, no accounts. Open it and play.
The tools help without holding your hand: pencil notes to mark candidates, undo to step back, hints when you're stuck, and a timer that quietly tracks your best. Locked givens and correct entries stay put; wrong guesses stay editable.
Six themes — Mint, Indigo, Sunset, Grape — in light or dark, plus adjustable zoom for any screen. Fully offline, saves as you go, resumes exactly where you left off.
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Three grid sizes
Small 4×4 for quick rounds, the classic 9×9, and a huge 16×16 hex grid (1–9, A–F) for serious solvers.
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Tools, not hand-holding
Pencil notes, undo, hints, and a built-in timer. Help when you want it, out of the way when you don't.
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Themes, light and dark
Mint, Indigo, Sunset, Grape — or follow the system. Adjustable zoom for comfortable play on any screen.
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Offline and private
No sign-up, no internet, no accounts. Every puzzle has exactly one solution, and progress saves automatically.
Out now on Android. Free to play, no accounts, runs offline. iOS coming soon.