The evil Balrog of Triad has kidnapped princess Celeste, granddaughter of the great white wizard Wilgus, and took the magical necklace. You must find them!
Initially seems to have been published in The Captain 80 Book of Basic Adventures in 1981 for TRS-80.
Included on one of the disks from Micro-Fantasy Magazine.
Published as a type-in game for C64 in the book Castles & Kingdoms by Virgin Books, 1984. The Commodore port was by Andrew Swanson.
A version of the game is included on several European PD compilations as Balrog of Triad.
The story continues in The Fortress at Time's End.
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Looking at the aka titles, I'm intrigued... how does a fortress seek revenge? Throwing its walls at someone?