HELLO, AND WELCOME TO YOUR SECOND ROUND OF MANDATORY EMPLOYEE TESTING.


Catalyst is a Portal 2 modification set in the aftermath of Portal 1. In Catalyst, you play as an Aperture Science employee who has just been woken for testing when the facility is thrown into disarray. You will see for yourself what happened behind the now shattered walls of the enrichment center, and discover what ancient programs keep it in perpetual motion.


Catalyst is planned to contain:

  • A full singleplayer campaign with a unique story for casual and devoted Portal fans alike.
  • Many new and fresh Test Chambers to keep you thinking and puzzled.
  • The return of the infamous High Energy Pellet, with a new accompanying element for further interaction.
  • New, fresh, and reimagined characters to meet in Aperture.
  • A new spin on a classic formula of an antagonist.
  • New takes on familiar environments.
  • And a completely new soundtrack!

Catalyst is still early in development, and we would appreciate all the help we could get! Please contact us on our Discord for any questions you might have.


Join The Official Discord Server: Discord.gg
We provide updates and you can communicate directly with the team!


Catalyst has no association with the former Conversion Team whatsoever, no developers, content, or people who have been associated on Conversion are part of Catalyst, however, we have full permission to do the mod.


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I will wait for this!

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