The developers of the game have done a serious job in challenging the advanced players. There are 9 difficulty levels in Civilization IV - much more than in the previous versions:
- Settler
- Chieftain
- Warlord
- Noble
- Prince
- Monarch
- Emperor
- Immortal
- Deity
The difficulty level you choose has a number of subtle but important effects on play – in almost every aspect of the game. Those effects are described below, categorized. Overall, the "Noble" level is a "fair" one - the AI and you play under same conditions. In the lower levels you receive "bonuses" over the computer and on the higher ones - the computer has advantages over the human. Survival on "Deity" level is almost impossible - but if you are really good - you can even win!