This game is the best computer strategy game ever conceived by the mind of man, right behind classics such as chess and Risk. This game challenges you to create a civilization, utilizing resources, crafting alliances, and waging war. Difficulty of playing can be chosen by the player. This game can be extended by extension packs made by the creator, and they are worth it. Entirely new aspects of the game are added in Brave New World, my favorite extension, as well as new civilizations. If you like strategy, then this game is for you. Learning curve isn't big, but it takes you about 30 minutes to understand the basics with the help of the tutorial (which is just helpers while you play the game).