Note: this Bonus Content pack is a Zip archive. You will have to open it from your local Steam folder.

This free DLC includes :

- The artbook Catyph: Making A Game On My Own, in PDF format, which looks back at the creation of the game in 2015-2016 by its solo developer. Contains a lot of images that were used as environment backgrounds, a Making Of, the Datalog, a retranscription of the story, and many other details.

- The original soundtrack of Catyph composed by Karreo (mp3).

- The OT booklet (English only) that you can print and use to translate the OT stone in the abandoned spaceship.

- The opening short film, the game cover.

Catyph is a 2d adventure game based on still images (point and click type) that is played in first person view (Myst-like), initially developed in 2016 by a single person.