The Sandbox of god is a puzzle at heart, where every decision you make affects your outcome in the end.
For instance: I can use each godly power only once. So say I use the rain function. Then I make a comet hit the earth. The ground, being mushy, allows the comet to get stuck in the ground and become a mountain.
BUT if I use the comet function first, the comet will leave a big crator. Then by using a rain function, I can fill the hole with water, making a lake.
Of course, given that this game spans multiple eras over millions of years, with each decision affecting the ultimate outcome at the end...well, it's up to you on how you want your planet to evolve.
Originally released in 2004 but given a major rehaul for 2010, the Sandbox of God will challenge your skills and have you creating vast worlds in no time. Good luck!