Standard
Normal puzzle for your chosen type, size, and difficulty. Timer off by default — no race unless you want one.
Just Sudoku by Nonnie Games
Sudoku, your way — calm grids and clever variants
Open it, think in numbers, nothing else. Classic Sudoku and thoughtful variations in one distraction-free app — large readable grids, hints that teach in plain language, unlimited puzzles, and automatic saving. No ads. No subscriptions. Works offline.
The Just… promise
A quiet place to think
Most Sudoku apps treat you like inventory — ads, hint packs, tiny grids, timers, and variants locked behind subscriptions. Just Sudoku is built for comfort, trust, and room to think — not session-length maximization.
Launch directly into your current puzzle or a sensible default. No accounts, no internet, no noise. The grid and keypad fill the screen; menus stay out of the way.
The game is the UI
Most of the screen is the grid
Large numbers, comfortable touch targets, and a keypad you can trust. Highlight matching digits, peers in the row and column, and optional conflict checking — comfort settings stay free.
Notes, auto notes, smart notes, unlimited undo and redo, and eraser support — everything you need for a real solving session.
Classic 12×12
A bigger board when you want more
Classic Sudoku on 4×4, 6×6, and 9×9 stays free forever with full tools. Step up to 12×12 for a longer think — included with Just Sudoku Pro, not a separate subscription.
Same calm play surface: notes, hints, undo, and auto-save work the same whether the grid is small or large.
Jigsaw Sudoku
Irregular regions, same logic
Jigsaw replaces neat 3×3 boxes with shaped regions you still read at a glance. Borders stay clear without relying on color alone — a fresh twist on the classic rules.
Part of Just Sudoku Pro alongside Diagonal, Killer, Thermo, and Wordoku. Preview rules and an example board before you unlock.
Killer Sudoku
Cages, sums, and hints that teach
Killer adds dotted cages and target sums — no repeats inside a cage. It is one of the Pro variants, with hints that understand cage logic when you ask for a nudge or an explanation.
Nudge, Explain, and Reveal stay unlimited and free on every type. Hint use never penalizes your stats.
Thermo Sudoku
Follow the heat
Thermometers run from bulb to tip — digits must increase along each one. A visual constraint that rewards careful scanning without cluttering the grid.
Variant-aware hints name thermo direction when you need help. Unlock Thermo and the full Pro collection with a one-time upgrade.
Wordoku
Letters instead of digits
Wordoku uses A–I on a 9×9 grid with the same Sudoku rules. Some puzzles hide a word to discover along the way — letters, logic, and a little surprise.
Change Puzzle lets you pick type, size, difficulty, and play mode. Continue Game stays obvious whenever a save exists.
Play modes
Options on supported types — not separate engines.
Gentle
Straightforward deductions, optional mistake prevention, helpful copy, and the timer hidden by default. Forgiving, not childish — plain language, no mascots.
Quick Finish
Start mostly filled — about 10–20 empty cells on 9×9, scaled for other sizes — for a short session when you have a few minutes.
Built for calm play
Difficulty reflects logic required — not just how many givens were removed.
Auto-save
Close the app and return later — your puzzle, notes, and progress restore automatically. Save metadata remembers type, size, difficulty, and mode.
Accessibility
High-contrast board, large number display, reduced motion, left-handed layout, and screen reader labels for grid, selection, givens, notes, and conflicts — all free.
Themes
Light, dark, or system theme; table backgrounds with a free base set and extended photo themes in Pro. Random theme each puzzle if you like variety.
Optional stats
Low-pressure counts and times if you enable the timer — no streaks, leaderboards, achievements, or daily rewards.
Just Sudoku Pro
One-time upgrade for Diagonal, Jigsaw, Killer, Thermo, Wordoku, Classic 12×12, and extra decorative themes — not for undo, hints, notes, or comfort options.
Understated wins
Quiet completion — Play Again or Change Puzzle. No confetti economy, no ad gates, no nag walls mid-puzzle.
What we leave out
No ads. No subscriptions. No tricks.
Just Sudoku respects your time and attention. Free Classic Sudoku forever with full tools — not a crippled trial. No hint currencies, no daily caps, and no accidental ad taps.
100% offline. No account required. Just puzzles.
Just Sudoku
No ads. No subscriptions. Unlimited Classic Sudoku. Available on Windows and Android; iOS coming soon.
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