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Difficulty level - Player resources (valuable/common/gold) - AI strength
1 - 15/30/30000 - approximately 50%
2 - 10/20/20000 - approximately 75%
3 - 7/15/15000 - 100%
4 - 4/10/10000 - 100%
5 - 0/0/0 - 100%
That's why I said that there isn't much difference between levels 3-5, because the AI plays the same, and resources on a large map aren't that important...
And what about 200% and 150%? :)
The AI's resource amount doesn't change; it's always standard - 7/15/15000.
How can you be sure of this? How did you find out? :)