The game's events take place in the year 2219, hundreds of years after humanity has spread beyond Earth. The internet exists as a virtual realm holding all human knowledge called Eden. A project is underway to resurrect the personality of Lumi, the first person born in space, using her preserved memories split into the Archives. Viruses unexpectedly infect Eden and endanger Lumi's existence, with the player being tasked with cleansing Eden's Archives and saving both it and Lumi.
The game is split into six levels called Archives: five make up the main campaign, with a sixth unlocked as a post-game challenge. Each level is replayable, changing each time depending on the player's performance and style of play in the previous run. The aim is to get through each Archive, defeat its boss, earning points and Stars to unlock more levels. In addition to standard controllers, each version uses motion controls as an alternative; the motion technology uses Kinect for Xbox 360 with different actions mapped to hand and arm movements, and PlayStation Move for PlayStation 3 incorporating swiping and stabbing motions with the control sticks.
Source: Wikipedia, "Child of Eden," available under the CC-BY-SA License.