After "Balance of Power", Crawford began work on an entirely new game, ', released in 1987 and selling only a few thousand copies. Mindscape was disappointed, and pressured Crawford to do a follow-up to "Balance of Power". The company pressed him hard on it, and Crawford felt that he "owed them one" after publishing "Siboot". This sequel was released in 1989 as ' on the Apple IIGS, Windows, Macintosh, Amiga and Atari ST. Crawford does not consider it a proper sequel, saying he was simply "tidying up, adding some bells and whistles." "Balance of Power: The 1990 Edition" adds more countries, advisors, to help the player, a new "multi-polar" level that allows countries to generate events of their own (such as declaring war on other countries) and a 2-player hotseat mode.