In 'ChronoCrux', players assume the role of a time-traveling librarian named Quill who guards the knowledge of every era. When a mischievous time thief starts altering key historical events, Quill must navigate through various time periods to restore the timeline. Players make choices that affect the course of history, interact with famous historical figures, solve riddles based on historical facts, and uncover the thief's true motive. Each decision resonates throughout time, leading to branching storylines and multiple endings based on players' actions.