DuoForm support

Tap Hint to see the cell to focus on, the clues behind it and why a filled or hollow circle belongs there. Tap Fill cell to place it, or enter the circle yourself. One hint covers both the explanation and optional fill.

Each puzzle starts with three free hints. After those are used, you can choose to watch an ad for one more hint. Reopening the same explanation without changing the board is free. Remove Ads includes unlimited hints.

The hint is added when the ad reports that you earned its reward. Wait until the ad says the reward has been earned before closing it. If it still fails, email us with your device model, iOS version and what happened. Please don’t include payment details.

Open DuoForm → Settings → Restore Purchases. Use the same Apple Account that made the purchase and check your internet connection. A verified purchase removes ads and enables unlimited hints.

If you need a refund, visit Apple’s Report a Problem page. Apple processes refunds.

Your puzzles and statistics are saved on the device you play on. DuoForm currently does not sync progress between iPhone and iPad. Deleting the app may remove local progress. Device backups and restores are managed by Apple and your device settings.

Reset clears your entries in the current puzzle and keeps its original clues. It preserves your level, elapsed time and hint usage. Tap Undo to restore your entries if you change your mind.

Each completed practice puzzle advances the level for that difficulty. Levels count your completions; they don’t make that difficulty progressively harder. The daily challenge changes at midnight UTC.

Yes. Open Settings to change sound effects, haptics and the solve timer. Sound effects respect silent mode.

Open Settings → Ad privacy choices when that option is available. It appears when Google’s consent service requires it for your region or consent state. Read our privacy policy for more information.