Living a largely isolated existence in an attic bedroom, teenager Casey (Anna Cobb) was all in as she took an online challenge that required her to record and share any physical or mental changes that resulted from her playing. As her disquieting uploads draw outreach from a fellow participant (Michael J. Rogers), is he looking out for her well-being, or leading her down a dark path? Jane Schoenbrun's unnerving study also stars Holly Anne Frink. 86 min. Widescreen; Soundtrack: English; Subtitles: English (SDH0; audio commentary; featurettes; extended ending scene; theatrical trailer.