Both possibilities are most strongly hinted at on the sixteenth level. On that level, an encrypted mission report, written by an unknown group of persons aboard an "artificial moon" and left on a computer to be discovered and decrypted by the player, mentions clones being trained in a "Logic Training facility" on the artificial moon along with the discovery of a planet that is named by the writers as "Terra Prime", and is reported as being called Earth by its inhabitants. This strongly suggests that the writers may be extraterrestrial aliens; the report also mentions hostilities from the inhabitants of the planet after the writers' presence in the Solar System was uncovered, and of the measures taken against it by the writers of the report, including the creation of a clone to "hopefully save the planet"; this clone is hinted at the end of the report as being the player.