was published. The game is set in an alternative history in which certain now discredited Victorian scientific theories were probable and led to new technologies. Contributing authors included Frank Chadwick, Loren Wiseman, and Marcus Rowland. William Gibson and Bruce Sterling's novel The Difference Engine (1990) is often credited with bringing about widespread awareness of steampunk. This novel applies the principles of Gibson and Sterling's cyberpunk writings to an alternative Victorian era where Ada Lovelace and Charles Babbage's proposed steam-powered mechanical computer, which Babbage called a difference engine (a later, more general-purpose version was known as an Analytical Engine), was actually built, and led to the dawn of the information age more than a century "ahead of schedule". This setting was different from most steampunk settings in that it takes a dim and dark view of this future, rather than the more prevalent utopian versions. Nick Gevers's original anthology Extraordinary Engines (2008) features newer steampunk stories by some of the genre's writers, as well as other science fiction and fantasy writers experimenting with neo-Victorian conventions. A retrospective reprint anthology of steampunk fiction was released, also in 2008, by Tachyon Publications. Edited by Ann and Jeff VanderMeer and appropriately entitled Steampunk, it is a collection of stories by James Blaylock, whose "Narbondo" trilogy is typically considered steampunk; Jay Lake, author of the novel Mainspring, sometimes labeled "clockpunk"; the aforementioned Michael Moorcock; as well as Jess Nevins, known for his annotations to The League of Extraordinary Gentlemen (first published in 1999). Younger readers have also been targeted by steampunk themes, by authors such as Philip Reeve and Scott Westerfeld. Reeve's quartet Mortal Engines is set far in Earth's future where giant moving cities consume each other in a battle for resources, a concept Reeve coined as Municipal Darwinism. Westerfeld's Leviathan trilogy is set during an alternate First World War fought between the "clankers" (Central Powers), who use steam technology, and "darwinists" (Allied Powers), who use genetically engineered creatures instead of machines. "Mash-ups" are also becoming increasingly popular in books aimed at younger readers, mixing steampunk with other genres. Stefan Bachmann's The Peculiar duology was labeled a "steampunk fairytale," and imagines steampunk technology as a means to stave off an incursion of faeries in Victorian England. Suzanne Lazear's Aether Chronicles series also mixes steampunk with faeries, and The Unnaturalists, by Tiffany Trent, combines steampunk with mythological creatures and alternate history. While most of the