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OPUS: The Day We Found Earth is an adventure game focused on story and exploration, developed by Team Signal, an independent game developer in Taiwan. It was first released on iOS and Android on October 22, 2015. ^[1] A port version for PC was later released on Steam, available for Windows and Mac OS X users. ^[2] The game was nominated for Best Meaningful Play at the 12th International Mobile Gaming Awards on February 16, 2016. ^{[3] [4]}

OPUS: The Day We Found Earth is a point-and-click, exploration adventure game where the player has to use a space telescope to search through cosmos, looking for Earth. By locating and scanning nearby stars, the player makes progress and unlocks areas of the spaceship. As a new area is unlocked, the player can examine items and facilities inside to explore stories of each characters through secrets scattered throughout the spaceship.

In telescope mode, the player first chooses a mission, which provides some hints to locate a potential Earth. The player then moves the telescope around to scan for nearby stars. When the target is located and scanned, the player will get an analysis report of that planet, including radius, mass, temperature, water, and Earth similarity. Once discovered, the planet can be named by the player with free will.

Every time the player finishes a mission, the scene goes back to the spaceship, unlocking new missions and areas occasionally. The story unfolds progressively as more areas become available on the ship. When the player clicks on an item or a facility that can be interacted, dialog will show up and sometimes clues can be found to unlock special missions, where the target can be stars, asteroids, and even supernova.

The story of OPUS: The Day We Found Earth begins tens of millions of years from now. By that time, human has left their home planet Earth, living in other planets for long. Earth has become a mythical planet and the belief in its existence has been considered a religion called "Earthology". On the other hand, as genetic modification became very common for humans, the human gene pool has deteriorated after millennia of genetic engineering. The only way to revert this damage is to trace back to the oldest sample of genes left on their long forgotten home planet. Project Earth was then founded and a spaceship named OPUS was launched in order to search for Earth to save the failing human race. The story follows a child-like robot Emeth, who is built by doctor Lisa, a crew member of OPUS, to support the mission. Emeth was shut down for unknown reason and when he's on again, he finds himself alone on the ship until the artificial intelligence hologram of doctor Lisa is activated. Emeth decides to carry on his mission with the help of hologram Lisa to keep his promise to find Earth.

The original soundtrack of OPUS: The Day We Found Earth was first released on October 21, 2015 on Bandcamp. ^[5] It was later released on Steam as a downloadable content for the game. ^[6] All music played in game are included with four bonus tracks. All tracks are written, produced and recorded by Taiwanese musician Triodust.

OPUS: The Day We Found Earth has received mostly positive reviews on Google Play Store, App Store, and Steam, with many praising the game's story, characters, graphics, and musics but criticizing its short length. The game has received multiple recognitions including Google Play Editors' Choice ^[7], and nomination for Best Meaningful Play at the International Mobile Gaming Award of 2016 ^[3].