Vault Assault suggests, by its name, a mission to break into a heavily guarded vault or safe, a direct-action premise common in the early-80s catalog. There isn't, however, enough reliable documentation to pin down its specific development, its exact platform of origin, or its release year with certainty.
Faced with that lack of certainty, we prefer honesty: it's one more piece of the era's scattered catalog, of interest to the curious collector rather than a well-documented chapter of the medium's history.

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