 In February 2015 a "Blue Archer" was revealed as a new playable character for the expansion "Dark World", developers stated her appearance was based on that of Anita Sarkeesian. An expansion pack, Dark World, was released in North America on May 12, 2015, for the PlayStation 4 and PC (Linux, OS X, and Windows) via Steam, the Humble Store, and GOG.com. The European PlayStation released followed several days later. The pack includes a four-player multiplayer campaign mode where players fight boss battles together and can resuscitate each other. It also adds a power-up that makes arrows explode by remote-detonation. The pack began as a set of new levels and became four sets, ten new characters, procedurally generated levels, and the aforementioned power-up, co-op, and boss battles. A PlayStation Vita version was released on December 15, 2015.
