It is the 12th century in Sherwood Forest, England.
Your name is Will Scarlet.
Designed as an example adventure for budding adventure writers, Castle was distributed as public domain, possibly as early as 1987, with the option to pay for the source code.
This game is most commonly referred to as Castle of Doom on various public domain disks and archive sites, despite the title Castle being shown on the loading screen.
Appears to be related to the Robin Hood mythology, though having Will Scarlett as the protagonist for once.
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