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MECC's math game from the school computer lab: steer a green Muncher around a grid, eat every number that fits the rule, and stay away from the Troggles. It came out on the Apple II in 1986 and was still in computer labs through the '90s.
The computer-lab game that taught westward expansion through dysentery and desperation. Every 90s kid named their wagon party after friends, overhunted buffalo, gambled on river crossings, and died of unexpected causes while technically learning American history.