# CORDON: Reactor Puzzle — Build Walls to Trap Particles

> Build Walls to Trap Particles (iPhone/iPad app by Stefan Hergert.)

- Source: https://appshunter.io/ios/app/cordon-reactor-puzzle/id6816334997 (this page in markdown: same URL + `.md`)
- Developer: [Stefan Hergert](https://appshunter.io/developer/1861706247)
- Category: Games, Puzzle, Strategy
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 16 MB
- Languages: American English
- Released: 2026-09-30
- Data updated: 2026-10-09

## What is CORDON?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Game | $2.99 | one-time |


## Is CORDON safe?

Not enough ratings yet to assess CORDON.

## Is CORDON legit?

CORDON: Reactor Puzzle appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for CORDON is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.1 — 2026-10-07

Minor improvements and updated store texts.

### 1.0 — 2026-09-30

No release notes.

## More apps by Stefan Hergert

- [Chart Race](https://appshunter.io/ios/app/chart-race/id6756600404)
- [SPECTRA: Find & Zoom](https://appshunter.io/ios/app/spectra-find-and-zoom/id6757806584)
- [Shuffle Merge](https://appshunter.io/ios/app/shuffle-merge/id6758698951)
- [Pixel Evolution Lab](https://appshunter.io/ios/app/pixel-evolution-lab/id6759259445)
- [Pixel: The Challenge](https://appshunter.io/ios/app/pixel-the-challenge/id6785946309)
- [PixelPlenum: Globe Quiz 3D](https://appshunter.io/ios/app/pixelplenum-globe-quiz-3d/id6788765741)

All apps by Stefan Hergert: https://appshunter.io/developer/1861706247

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*