Source: Wikipedia, "http://en.wikipedia.org/wiki/Myth_(1989_adventure_game)," available under the CC-BY-SA License.
Myth is a text adventure game by Magnetic Scrolls released in 1989.
Zeus has ordered the gods of Olympus to perform various tasks to impress humanity. As Poseidon, your mission is to steal the Helmet of Invisibility from Hades.
This game was only released in limited numbers to members of the Official Secrets adventuring club. It is shorter than other Magnetic Scrolls adventures.