In 'Chrono Chums: Who's There?', players traverse different timelines to solve the mystery of their friend's sudden disappearance during a high-stakes temporal experiment gone wrong. Utilize time travel mechanics to interact with key events and quirky historical characters while piecing together clues scattered across time. Each choice affects the timeline and the outcome, leading to multiple endings that reflect your decisions. Collaborate with eccentric time-traveling companions known as 'Chrono Chums', each with their own peculiar abilities and backstories that unfold as you navigate the enchanting yet dangerous realms of time.