Support

It is free to play. Every classic-cipher stage and the XOR cipher are free. Hint tickets, Remove Ads, the Modern Cipher Pack, and Premium (all-in-one) are optional in-app purchases. No ads are shown while you are solving a puzzle.

Each puzzle has staged hints. The first hint is free and recaps the cipher type. If you are still stuck, you can reveal more in stages: the direction to take, then the first few letters, then nearly the answer. Start with the first hint.

From the second hint onward, each hint uses one ticket. Tickets are available as in-app purchases in Settings (1 ticket / pack of 10). When you are out of tickets, you can also get one by watching a video ad to the end from "Watch a video for +1 hint" in the hint area (while no ad is ready, the app says it is preparing a video). With Premium, hints are unlimited.

Yes. Purchasing "Remove Ads" or "Premium" hides all banner and full-screen ads. Hint videos only play when you choose to watch one.

An in-app purchase that unlocks the public-key (simplified RSA), hash function, and block cipher stages. The classic ciphers and XOR are free. It is also included in "Premium."

Remove Ads, the Modern Cipher Pack, and Premium can be restored with "Restore" in Settings. Make sure you are signed in with the same Apple ID / Google account you bought with. Hint tickets (consumable) cannot be restored. If it still doesn't work, contact us below.

Progress is stored on your device and may be lost if you delete the app or change devices. Please contact us if you need help.

Personalized ads: change "Show personalized ads / Don't personalize" at any time (on iOS, ads are personalized only if tracking is also allowed in ATT) under "Ad settings" on the Settings screen.
iOS tracking (ATT): turn it on or off under Settings > Privacy & Security > Tracking > NazoRaku.
Android advertising ID: reset or delete it under Settings > Privacy (or Google) > Ads.
See the Privacy Policy for details.

iOS 17 or later (iPhone / iPad), and Android 8.0 (API 26) or later (phones and tablets).

The menus and the puzzle prompts and hints are available in Japanese and English. The app follows your OS language, so change it in the Settings app.

Email us at the address below. Steps to reproduce, your device model, OS version, and app version help a lot.