One version is common, at least one other version is rare
 Game idea & concept by Peter Börner, Thomas Kruza, Tobias Richter, A. Graf von der Schulenburg and Holger Gehrmann. Coding by Peter Börner, Thomas Kruza and A. Graf von der Schulenburg. Graphics by Tobias Richter. Music by Karsten Obarski. Translations by Rachel Gauntlett.
 Originally released in Europe in 1989, OIL IMPERIUM was later released in 1990 in the U.S. as BLACK GOLD.
 OIL IMPERIUM was the first (and perhaps last) game released in The Mind Games series.