CORDON: Reactor Puzzle

Build Walls to Trap Particles

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

Energy is loose in the reactor. You can't touch the particles – but you can reshape the space around them. CORDON is a calm, clever puzzle game about containment. Draw barriers across the chamber, seal off pockets and trap glowing energy before it slips away. Every barrier grows from where you tap – and it stays fragile until it reaches a wall. Timing, planning and a steady hand win the day. HOW IT PLAYS • Tap to raise a barrier, swipe to aim it • Squeeze particles into a small space, keep apart what must never meet, guide them into collectors • Plan with a limited number of barriers or a tight energy budget • Earn up to three stars per level for elegant solutions 100 HANDCRAFTED LEVELS Ten sectors, each with a new idea: magnets and repulsors, rhythm gates, damper fields, currents, phantom particles that drift through ordinary walls, one-way membranes, sensor plates and transmuters that turn one particle into another. The final sectors combine everything – no hints, just you and the reactor. SEVEN KINDS OF PARTICLES Steady ions, fast sparks, heavy mass, charged particles that follow magnets, volatile flares that react on contact, seeds that multiply while they have room – and phantoms. LEARN AS YOU PLAY Press and hold anything in the reactor to see what it does. The built-in encyclopedia explains every particle, tool and device with live animated demos. MADE WITH CARE • Glowing neon visuals and a calm ambient soundtrack • Music, sound effects and vibration can be switched off separately • Plays offline – no account, no ads, no tracking • Sector 1 (10 levels) is free – unlock all 100 levels with a single in-app purchase, no subscription • English, German, Spanish and French • Designed for iPhone and iPad Seal the core. Contain the energy. Enter CORDON.

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Minor improvements and updated store texts.

Version 1.0.1

The developer, Stefan Hergert, 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
    Stefan Hergert
    Size
    17.2 MB
    Category
    Puzzle
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPad
      Requires iPadOS 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+
    In-App Purchases
    Yes
    Copyright
    © 2026 pixelplenum
  • Developer Website
  • Privacy Policy

    • More by Stefan Hergert