Middle-earth Quest (MEQ) was a series of solo adventure paperback books based on the QuestGame System, published by Iron Crown Enterprises.
Two more sequel books were promised to be available (Search for the Palantír and Race from Rivendell), but never reached publication.
From the publisher
COME TO MIDDLE-EARTH!
The world of brave and cruel Men, Hobbits and Elves, Dragons and Dwarves, Orcs and Trolls, and Wizards both good and evil lives on in this series of Middle-earth Quest gamebooks. You too can now become entwined in the world's richest tapestry of high fantasy.