SimCity 2000 - 1993 VG is rated/received certificates of:
USA:E
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SimCity 3000 Unlimited - 2000 VG is rated/received certificates
of:
USA:E
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In the case with the CD.
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SimCity 2000 has been offered for free at times in the past by
EA Games, on the Origin platform. So, when you see it offered for
free, that is where you would need to get it.
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Simcity 4 is a commercial, copyrighted product and cannot be
legally downloaded.