You must get to the central terminal to reset the computer on your space ship. But watch out for locked doors, robots digging holes, and a roving alien with a transporter beam.
This was published by COMPUTE! Publications as a BASIC type-in listing in COMPUTE!’s Second Book of VIC games, pp. 179-191.
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Sigma Mission can be downloaded here: http://www.vic20listings.freeolamail.com/book_computegames2.html#ch5sm
There is some kind of random events, with an upset alien "stealing" you objects and sending you back to the start.