Support
TwentyFour is an offline math puzzle: take four numbers and use + − × ÷ with parentheses to reach exactly 24. It has no account, no advertising and no network access.
Getting in touch
Email pangkunyi@gmail.com. Please include your device model, your operating system version, and the app version from Settings → About (shown at the bottom of the settings page).
zowle
Room 8201, Building 9, Nantian No. 2 Garden, Futian District, Shenzhen, Guangdong Province
Common questions
My progress is gone. What happened?
Progress is stored only on your device. Uninstalling the app, clearing its storage, or using the system's "clear app data" function removes it, and it cannot be recovered afterwards — there is no server copy. This is also why the app never asks you to sign in.
How do I delete only the puzzles I saved?
Open the book mode from the top bar and delete them individually.
The hint button is greyed out in timed mode.
That is intentional. Asking for an answer in a timed run starts a 30-second cooldown, so that a run measures speed and accuracy rather than how fast you can tap.
Can I change the language?
Yes. Open Settings → Language and pick one of the 21 languages the app ships, or leave it following your device language. On Android 13 and later, your system settings also has a per-app language picker that writes the same choice.
The app makes a sound. How do I turn it off?
Settings → Sound & haptics. Sound is off by default; haptics are on.
Does the app send anything anywhere?
No. It makes no network requests and declares no network permission. See the privacy policy for the details.
Privacy
The full text is at https://pangkunyi.github.io/legal/twentyfour-legal/privacy.html, and it is also readable inside the app under Settings → Privacy policy.