The Tolkien Quest and Middle-earth Quest books were published by Iron Crown Enterprises when they had a license with Tolkien Enterprises to produce games based on Tolkien's works.
These interactive adventures books were among the most complex gamebooks ever published, using hex maps to allow movement and each featuring about thirty pages of rules in each volume with the rules and optional rules divided into three complexity levels:
Note: Tolkien Enterprises deemed the gamebooks a violation of the game license. First two books, published under Tolkien Quest series, and two more were planned under the Middle-earth Quest series when licensing disputes arose. First four book were recalled and destroyed, making these rare. The fourth book Murder at Minas Tirith was marketed but never released. Subsequently the licensing issues were resolved but books 5 through 8 were numbered 1 through 4, in denial of the existence of the earlier works. Some of the books were published in partnership with Berkley.
The original intended series order of the books
1. Night of the Nazgûl
2. The Legend of Weathertop
3. Rescue in Mirkwood
4. Murder at Minas Tirith -- unpublished
5. A Spy in Isengard
6. Treason at Helm's Deep
7. The Mines of Moria
8. Search for the Palantir