Murky
Deity
The formula for the score isn't specified. The manual just says it's a combination of factors; time, map size, population, conquered citizens, difficulty level, etc. There are bonuses if you defeat the Guardian and Anatarans. My highest score so far is about 2100. In that game, it was a huge map, impossible difficulty. I had conquered all the AIs except for one tiny planet, to keep from winning by conquest. I defeated the Guardian and won the game by winning the battle at Antaries.