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SudoFlex

A clean Sudoku game for Android. Play 6×6, 9×9, and 12×12 boards, keep notes and undo close, and watch your streaks grow — with nothing to sign up for.

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6×6 · 9×9 · 12×124 difficultiesAd-free upgradeNotes & undoStatisticsCustom puzzles

Everything in one board

A full Sudoku toolkit, built for focus

Choose a board size, drop in notes, undo freely, and keep your stats and custom puzzles close — with no accounts and nothing to sign up for.

3 sizes

Boards for every mood

Play 6×6, 9×9, and 12×12 grids across four difficulty levels, from easy to challenge.

Full control

Notes, undo, and pause

Add pencil marks, undo mistakes, pause the timer, reset the board, or reveal the solution.

Live stats

Track every streak

Best and average times, win rate, win streaks, and a full history of every game you play.

On-device

Play anywhere

No accounts and no sign-up. Puzzles are generated on your device, so a connection is never needed to solve one.

Your style

Make it yours

Themes, dynamic color, board appearance, and two input methods to match how you play.

Custom puzzles

Create and import

Build your own puzzles by hand or from a string, and keep them tidy in folders.

See it in action

From first tap to a finished board

Play the puzzle, review your result, follow your progress, and build your own boards — without leaving the app or going online.

**Play the board**Notes, highlights, undo, and hints

**Review your win**Time, mistakes, and hints per game

**Track progress**Best times, streaks, and win rate

**Custom puzzles**Organize your own boards in folders

How it plays

Solve, review, and keep coming back

Move from a fresh grid to a finished puzzle without friction: place your numbers, check your work, and let SudoFlex remember every save, streak, and record for you.

Digit-first or cell-first input, with notes and undo on every move.
Optional mistake checking against the rules or the final solution.
Saves, statistics, and streaks that live entirely on your device.

Solve with focus

Tap a cell, drop in notes, and let identical-number highlights guide your next move.

Finish and review

Complete the board and see your time, hints, mistakes, and notes at a glance.

Watch your stats grow

Best times, win rate, and streaks build up as you keep playing.

Get the app

Download SudoFlex on Google Play

Scan the QR code from your desktop or tap the button on mobile to start solving — free, with no sign-up.