Dark Cavern suggests, by its name, a descent into some cave or dungeon system, a setting common in the action and exploration catalog of the early '80s. We don't have reliable sources, however, to confirm with certainty its development studio or the exact year of its release.
In cases like this, we prefer honesty over speculation: it's one more piece of that broad, scattered catalog that defines much of what we today call "other platforms," interesting to the curious collector rather than a title with a well-documented place in official history.

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