From the blog "News"

Defenders, We have some exciting news for DD1 fans! Ice has worked with the team behind DD1 Redux and found a way for CG to provide official branch support here on steam for the overhauled version of DD1. What’s DD1 Redux? Check out the summary, the story and the massive change log below. Shoutout to all of the fans who worked on this project, we are proud to support their work and provide a new opportunity for veterans of DD1 and newcomers alike!   What is Redux? Redux is a re-ima