Way back in the days before The Sims asserted its absolute dominance over all the land, the success of SimCity inspired a ton of different, sometimes weird Sim-style games, including SimEarth, SimGolf, SimCopter, SimHealth, SimAnt, and SimRefinery. You may not have heard of that last one because, as Wikipedia says, it wasn’t released to the public—it was developed by a business-oriented branch of Maxis for internal use at energy corporation Chevron.

Interest in the game was renewed in May when Ars Technica reported on an in-depth history of SimRefinery at The Obscuritory, a site dedicated to “odd, lesser-known games and software.” The game itself seemed out of reach, though.

“Nobody held onto SimRefinery because it didn’t seem important. It was a one-off, somewhat unsuccessful training program for an oil refinery in California,” The Obscuritory wrote. “In the grand scheme of Maxis, it was one of their least important titles,