Contact Us

Whether you have found a bug, want to suggest a feature, have a question about our policies, or just want to say something about the game — we want to hear from you. Use the form below to get in touch.

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Frequently Asked Questions

Why is the puzzle generation slow sometimes?

Each puzzle is generated fresh in your browser and algorithmically verified to have a unique solution. Harder puzzles require more verification steps. The process typically takes less than one second on most devices.

Can I play on mobile?

Yes. The game is fully responsive and works on phones, tablets, and desktop browsers. Tap cells to select them and use the on-screen number pad to enter numbers.

Is my game progress saved?

Game progress is stored only in your current browser session. Refreshing or closing the page will reset the game. We do not save game state to any server.

How do I use Notes mode?

Click "Notes OFF" below the grid (or press N on your keyboard) to switch to pencil-mark mode. Numbers entered in this mode appear as small candidates in the cell rather than filling the cell. Toggle it off to return to normal entry mode.

How do I report a bug or invalid puzzle?

Use the contact form on this page and select "Bug Report" as the subject. Describe what you observed as clearly as possible. We take bug reports seriously and will investigate promptly.