Room 93 is the debut extended play by American singer and songwriter Halsey. It was released on October 27, 2014 by Astralwerks. The project was re-released digitally on March 9, 2015, including a new version of "Ghost", this later is also included on the singer's debut full-length album Badlands. The sound of the EP is rooted on the electropop music genre. A digital remix version of the EP, featuring three remixes for the songs "Hurricane", "Ghost" and "Trouble" was released on March 3, 2015. Along with the remix EP, a "One Mic, One Take" EP was released on the same date. "Trouble" was featured on the promo of the episode "Best Laid Plans" of the TV series Once Upon a Time.