It says ' designed specifically for Castaway ' but is Castaway required?
Viewing post in Stranded: GM-less Guide to Castaway comments
There is a solo play system within that can be used for any Mork Borg, including the Paths solo system we created, solo combat, and Companions and Nemesis systems. Other elements like the tables and prompts will be flavored for Castaway specifically. With some creativity it could be a powerful solo tool for Mork Borg in general.