Civilization is a strategy game with the widest scope of its time. You are the leader of a nation and begin in the Stone Age, aiming to become the dominant civilization by either conquering all others or reaching Alpha Centauri first.
As the nation's leader, you have many responsibilities. You must build cities and manage them, constructing various buildings. The people in your cities work on neighboring lands to get food, production, and trade, which can be exchanged for luxuries that make people happy. You decide how much trade to invest into each area and ensure your people are in a good mood; otherwise, the city will collapse into disorder.
If you're ambitious, you can build Wonders of the World, such as the Pyramids or the Hoover Dam. Each Wonder is unique and gives benefits if completed, but takes time to build and may eventually stop working.
You'll have to invest in military units to protect yourself and attack others. You can sign peace treaties with other nations and exchange scientific knowledge, but eventually, you'll probably have to fight. You control each of your military units on the world map, attacking opponents' units and cities.
Not all units are for combat; Settlers build cities, create roads, and improve land around cities. Diplomats negotiate with other nations, create embassies, bribe enemy units, conduct espionage, and sabotage in enemies' cities. Caravans increase trade in foreign cities and help build Wonders.
Scientific progress is crucial. The more science your cities produce, the faster you research new technologies. You'll start with Alphabet or Bronze Working, but later, you'll research Computers and Robotics, which can give you new units, buildings, and effects like pollution.
Your city's prosperity depends on the type of government your nation has. Initially, you're living in Despotism, but it can stunt growth; consider switching to Monarchy, Republic, Democracy, or Communism.