One Step Behind

Two pieces. One turn apart.

Free · In‑App Purchases

Your echo follows each input one turn later. Guide both pieces to their exits at the same time. Play the first 10 puzzles free, in any order. Clear all 10 in a group to open the next. A one-time purchase gives access to puzzles 11–1000 as you unlock their groups. Find the shortest path to earn three stars, and replay puzzles to improve your best turn count. Undo and hints are available; progress and best scores stay on your device. Supports Korean, English, Japanese, Simplified Chinese and Traditional Chinese. No ads interrupt gameplay. Free players can optionally watch an ad for a hint; purchasing the full game also removes hint ads. Play offline. Ads, purchases and restoring require an internet connection; purchasing and restoring also require an Apple Account. Sound and haptics can be controlled separately.

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Choose any puzzle in each group of ten, earn up to three stars by finding shorter paths, and unlock the next group by completing all ten. This update also adds new puzzle names and a simpler stage selector. Your saved progress and purchases are retained.

Version 1.1.0

The developer, HYUNGYONG KIM, 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

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Identifiers
    • Usage Data

  • Data Not Linked to You

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

    • Diagnostics

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
HYUNGYONG KIM
Size
5.1 MB
Category
Puzzle
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
Languages
English and 4 more
  • English, Japanese, Korean, Simplified Chinese, Traditional Chinese
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 RunBySimple
  • Developer Website
  • Privacy Policy

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