A downloadable game for Windows, macOS, and Linux

Buy Now$6.99 USD or more

Copy Editor is an intricate puzzle game that teaches you Regular Expressions (RegEx), commonly used in computer science and language theory. Build complex rules that process and revise famous texts for your wacky and demanding publishers! 

Using characters, scripts, and sequences, your goal is to align your “Input” with the “Objective.” Like its spiritual predecessor, The Devil's Calculator, no familiarity with the concept is needed. The basics are learned through gentle tutorials, with the focus always on tactics and lateral thinking. While you will no doubt learn valuable RegEx skills, the fun of Copy Editor lies in its sophisticated and rewarding logic puzzles. You must navigate playful obstructions such as a limited number of rules, certain keyboard keys not working for particular levels, and an embellishment of RegEx that extends to Natural Language Processing allowing you to discriminate on criteria like sentiment analysis, stems and parts of speech.

Optimization is a big part of Copy Editor, and you can see how well you stack up to others with detailed breakdowns of your performance. In this way it is similar to RegEx Golf but far more elaborate and nuanced, since text replacement is of equal importance. Confident in your skills? A fully formed level editor will allow you to pose your own challenges to the community.

Whether you are new to using Regular Expressions or want to test your proficiency, Copy Editor promises a fun and challenging puzzle experience.


Buy Now$6.99 USD or more

In order to download this game you must purchase it at or above the minimum price of $6.99 USD. Your purchase comes with a Steam key. You will get access to the following files:

Mac OSX Build 162 MB
Windows Build 102 MB
Linux Build 98 MB

Download demo

Copy Editor Demo.app.zip 162 MB
Linux Demo 98 MB
Windows Demo 102 MB

Development log


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In Ubuntu, will not work in the itch.io app, Fortunately, your app image file works from the terminal.

My main wish is that there were more hints. I hoped this game would teach me as much as it tests me.