One Line Shift

One line. Cover every path.

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

205 hand-checked puzzles. No timers, no lives, no ads. The first 55 are free; one purchase unlocks the rest and everything added later. Hold a dot. Drag along the lines. Cover every path exactly once. That is the whole rule — and it is enough to leave you stuck for ten minutes, then see it all at once. It is a hard game — not because it rushes you, but because you have to see something. No lives, no countdown, no way to fail a level. Only "not yet". Lift your finger any time; the board waits exactly where you left it. Every rule is drawn on the board. There is no text on it, anywhere. The clock starts at your first touch, not when the level opens. Thinking is free. 205 puzzles: 5 to learn the idea, 150 to build on it, 50 with portals — where the hard part is working out where to start. The first 55 are free. One purchase unlocks the rest, and every level added later. No subscription, no ads. No account. No network. No data collected. It works in airplane mode; progress syncs through your own iCloud.

Ratings & Reviews

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Bigger, clearer text on the unlock screen. Updated store description.

Version 1.2

The developer, HOUJUN CO., LTD., 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 Not Collected

    The developer does not collect any data from this app.

    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
    • HOUJUN CO., LTD.
    Size
    • 844.8 KB
    Category
    • Puzzle
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Houjun Co., Ltd.
  • Developer Website
  • Privacy Policy

    • Supports

    • Game Center

      Discover new games and play with friends.

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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