What retro classic game connects?

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Answer:

Quoth adithya:

“The connect is M.U.L.E. It was one of the first multiplayer games ever, and was launched for the Atari 400 (3). The game setting was inspired by Time Enough For Love (1) and the decision to exclude an external authority on the moon was taken from The Moon Is A Harsh Mistress (2)”

Plz note, the Atari pic is backwards :p