Decoder Terminal

Crack the cipher in 7 tries

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

A secret cipher of four colored keys is hidden inside the system. You have seven attempts to crack it. DECODER is a code-breaking puzzle — a modern take on the classic Mastermind — wrapped in the aesthetic of a green-on-black decryption terminal. Lock in a guess, hit RUN, and the system reports back: • HIT — right color, right slot • NEAR — right color, wrong slot The hints never tell you WHICH slot is right. Read them, reason it out, and narrow the cipher down before your attempts run out. Crack it in four hits to breach the system. Burn all seven and the cipher stays sealed. NO LUCK. JUST LOGIC. Every cipher is solvable by pure deduction. There are no power-ups, no timers, no ads, no accounts — just you against the code. TWO CLEARANCE LEVELS • EASY · 6 colors — learn the ropes • ADVANCED · 8 colors — for hardened operators Colors can repeat, so don't assume the obvious. BUILT FOR THE CRAFT • A tactile CRT terminal interface — scanlines, glow, and a blinking cursor • Colorblind-friendly: every key carries a letter, never color alone • Honors Reduce Motion • Tracks your stats per clearance level: solve rate, current streak, and best run • Fully offline. No sign-up, no tracking, no nonsense. Read the hints. Breach the system.

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Performance and stability improvements.

Version 1.0.1

The developer, Twinning Trails LLC, 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:

    • Location
    • Identifiers
    • Usage Data

  • Data Linked to You

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

    • Identifiers

  • Data Not Linked to You

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

    • Location
    • Usage Data
    • 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
  • Twinning Trails LLC
Size
  • 6.4 MB
Category
  • Puzzle
Compatibility
Requires iOS 18.6 or later.
  • iPhone
    Requires iOS 18.6 or later.
  • Mac
    Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 2.6 or later.
Languages
  • English
Age Rating
4+
Copyright
  • © 2026 Twinning Trails
  • Developer Website
  • Privacy Policy

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