Opus: Echo of Starsong is a text-driven side-scrolling adventure game developed by Taiwanese independent studio SIGONO. It is the third installment of the Opus series, after Opus: The Day We Found Earth and Opus: Rocket of Whispers. Like its predecessors, the game focuses on story, puzzles and exploration.

Opus: The Day We Found Earth is an adventure game focused on story and exploration, developed by Taiwanese independent studio SIGONO. It was first released on iOS and Android on October 22, 2015, and received ports for Windows and OS X on April 22, 2016, and for Nintendo Switch on November 30, 2017. The game was nominated for Best Meaningful Play at the 12th International Mobile Gaming Awards on February 16, 2016.