Civilization 4

If you enjoy games that will force you to think, then Civilization 4 is the game for you.You start of as the first of a civilization.With simple knowledge of growing food and making fire and a few others (like reading).While you're starting others are starting and as you build your civilization they build theirs.As you progress you gain more knowledge and begin to expand.You are forced to balance research with feeding your civilization and protecting it also.You go up against some of the best artificial intelligence I've ever seen.Games can take months to complete and each game is different from the other.You have relationships with other civilizations and make treaties, alliances...and enemies!If you're up for a real challenge give Civilization 4 a shot.