The whole So1um PDF collection, and their transcription in Markdown.
So1um is a solo Role Playing Game designed & written by Matt Jackson.
It's published under the terms of the CC-BY 4.0 License.
You can also download the PDFs.
En français:
You can access the Version Changelog.
The first version was erroneously tagged '1.0', but it was supposed to be tagged as '0.1'.