Back in 2015, we announced the public beta of a book on roguelike development using Ruby.
Unfortunately, a lot has happened since then, and the project has been stuck for a while. We’ve decided to refund everyone who’d originally purchased it and opensource the project. It’s very exciting to be creating a book with the help of the community!
As we write this, the source for the build system is closed but we’re exploring ways of transitioning it into other solutions.