Comics has also published three supplemental books to date that expand upon characters and locations first introduced in the novels. The Dark Tower: Gunslingers' Guidebook was released in 2007, The Dark Tower: End-World Almanac was released in 2008, and The Dark Tower: Guide to Gilead was released in 2009. All three books were written by Anthony Flamini, with Furth serving as creative consultant. End-World Almanac and Guide to Gilead feature illustrations by David Yardin. A five-issue adaptation of King's novel The Dark Tower: The Gunslinger, titled The Dark Tower: The Gunslinger - The Journey Begins, began publication on May 19, 2010. The collected hardback edition was released on January 26, 2011. An adaptation of King's novella "The Little Sisters of Eluria", titled The Dark Tower: The Gunslinger - The Little Sisters of Eluria, began publication on December 8, 2010. The collected hardback edition was released on June 8, 2011. A second adaptation of King's novel The Dark Tower: The Gunslinger, titled The Dark Tower: The Gunslinger - The Battle of Tull, began publication on June 1, 2011. The collected hardback edition was released on January 25, 2012. A third adaptation of King's novel The Dark Tower: The Gunslinger, titled The Dark Tower: The Gunslinger - The Way Station, began publication on December 14, 2011. The collected hardback edition was released on June 27, 2012. Games December 7, 2009 saw the release of a spin-off online game titled Discordia, available to play free of charge on the official Stephen King website. The game is a continuation of the original Dark Tower story, following the war between the Tet Corporation and Sombra/NCP in New York, and it has been supervised by both Stephen King and Robin Furth. From the website: "Exploring the behind-the-scenes conflict between the two companies, Discordia introduces long-time Dark Tower fans to new characters and numerous mechanical/magical items developed by Mid-World's Old Ones. Over the course of our adventure we will visit many locations, both those familiar to Dark Tower fans and others which we only glimpsed in the Dark Tower novels. While we may not see Roland and his ka-tet in this adventure, the development team has remembered the faces of its fathers. We have done our best to honor the original Dark Tower series while simultaneously mapping new and exciting Dark Tower territory." Film Sony Pictures and Media Rights Capital adapted the series for film. The film