Origin, EA's digital distribution platform, occasionally runs a promotion that is called “On the House”. The best way to think of it is an abrupt, 100%-off sale. If you “purchase” the free game before they put a price tag back on it, then it is yours to keep. Today, the promotion has been applied to SimCity 2000. Log in to the Origin Store and add it to your catalog.
EA is using money hacks…?
On a related topic, can you believe that SimCity 2000 is just a few months away from its 20th birthday? Some believe that it is the best of the series, although I have never played it. This is one of the many titles that I overlooked, jumping from the original SimCity (Super Nintendo, rented a few times) up to SimCity 3000: Unlimited, which I played until SimCity (2013) launched. Ironically, I received a free copy of SimCity 4 because of the launch issues, so I now have everything from SimCity 2000, onward.
SimCity 2000 is currently free, but will go back up to its regular price at any time.