What are the AI and player modifiers for each difficulty level?
The difficulty bonuses for Civ are described on this wiki page. In general the game difficulty works such that
- Anything below prince gives you a bonus
- Prince gives no bonuses to anyone
- Above prince gives bonuses to the AI
I don't wan't to copy-paste all the values here (there are a lot), but I'll mention that the values being modified are:
- Science
- Culture
- Production
- Gold
- Faith
- Combat
- Research boosts
- Starting units
- Barbarian camp plunder yields