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Offline Mental Math Challenge

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Lost your signal? Don't waste the wait — sharpen your mental math instead. The app knows when you're back online automatically. Turn every dead zone into brain training. Lost signal? Make the wait count. You're on a train, scrolling through a webpage — then everything freezes. You've entered a tunnel, and your phone has lost its connection. Instead of staring at a loading spinner, open this app and put that idle time to good use with quick-fire mental math. Solve everyday arithmetic — the kind you actually use in real life, like totalling up a restaurant bill, working out a tip, or figuring out a discount at the shops. Race against a computer opponent and see how many you can get right before time runs out. Here's the clever part: the computer's speed is tied to your network signal. When your connection is weak or gone, the computer slows right down, giving you a fair fight. The moment your signal comes back, the computer speeds up dramatically — so fast that you'll almost certainly lose. That sudden loss is your cue: the internet is back, and you can pick up right where you left off. No time wasted waiting. No time lost switching back. Just a few minutes of genuinely useful brain training in between. FEATURES - Real-life arithmetic: addition, subtraction, multiplication, and division problems inspired by everyday scenarios - 9 difficulty levels, from beginner to expert - A computer opponent whose speed adapts to your real-time network latency - Automatic signal recovery alert — lose to the computer and you know you're back online - Global leaderboard ranked by mobile network operator - Multilingual support for 20+ languages - Dark mode and adjustable font size - No sign-up required — just open and play

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Bug fix.

Version 1.0.1

The developer, Man Ho Luk, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
Man Ho Luk
Size
23.5 MB
Category
Trivia
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English
Age Rating
4+
Copyright
© 2026 Far Neighbour Limited
  • Privacy Policy