This more ambitious follow-up to SimCity lets you play God-- take charge of an entire planet from its birth to its death--10 billion years later. Guide life from its inception as single-celled microbes to a civilization that can reach for the stars. Inspired by James Lovelock's Gaia hypothesis, SimEarth simulates the Earth as one interrelated living organism. It's a solid simulation that unfortunately suffers a bit from the too-dry gameplay and steep learning curve.Reviewed by: Underdogs