Civilization II: Fantastic Worlds

[CII: FW] added new scenarios that had many unique settings such as one scenario dealing with colonization of Mars, and one scenario called Midgard that had Elven, Goblin, Merman, and other civilizations from fantasy... Fantastic Worlds also contains a new scenario editor that allowed various units, city improvements, terrain, technology trees, placing triggers, and other additions that enhanced the game. (wikipedia.org)