Vampire's Castle Adventure

Vampire's Castle Adventure is an interactive fiction adventure game released in 1988 for DOS.

This short text adventure (written in a mere 181 lines of BASIC code) has the player exploring a vampire's lair in search of the game's "concealed goal." Not surprisingly, room descriptions are extremely terse and there aren't a whole lot of actions to perform. The parser accepts two-word commands (though it only looks at the first three letters of any given word) and has a vocabulary of about seventy words.