Difficulty level affects Europa Universalis II game play in several ways:

Effect of Difficulty on Humans Edit

The most important is that badboy wars only occur on very hard difficulty.

The amount of money in the player's treasury at the outset of a scenario is decreased with the difficulty level.

Military unit base costs, land support costs, and naval support costs all vary somewhat depending upon difficulty level. Base costs for military units increase 1d for each higher difficulty level.

Base costs for manufactories increase 50d with each higher difficulty level.

Losing badboy is faster at the lower difficulty levels.

Effect of Difficulty on AI countries Edit

There is a major difference between the effects on the AI at easy and very easy levels on one hand, and normal, hard, and very hard settings on the other hand.

Normal, Hard, Very Hard AIs Edit

On normal to very hard settings, the AI gets all income from all of its provinces at all times. Unlike a human, the AI gets income from looted, besieged, and uncontrolled provinces.

There is an income multiplier for one-province minors that depends on the difficulty level. A one-province minor gets four to six times income at normal difficulty, six to eight times income at hard difficulty, or eight to ten times income at very hard difficulty.

Difficulty level affects at what maximum percentage the AI may mint. The AI can mint more at higher difficulties (normal, hard, and very hard).

AI inflation is capped depending on how many years of play have passed and the difficulty level. At normal difficulty level, AI inflation may be at most 0.25% per year of play passed (a cap of 25% inflation after 100 years). At hard difficulty level, AI inflation may be at most 0.20% per year of play passed (a cap of 20% inflation after 100 years). At very hard difficulty, AI inflation may be at most 0.10% per year of play passed (a cap of 10% inflation after 100 years). Except for the inflation cap, AI inflation is otherwise the same as a human player's inflation.

Easy and Very Easy AIs Edit

At easy and very easy, the AI gets only the income it would normally get as a human player. The AI gets no tax income and gets reduced production income for looted provinces. The AI gets no income from besieged or uncontrolled provinces except that merchant tax from centers of trade is only lost for uncontrolled centers, and not besieged ones.

There is no income multiplier for one-province minors.

The AI can mint all of its income.

AI inflation is not capped. AI inflation may skyrocket during war time. During peace, the AI receives a negative inflation cheat that eventually reduces inflation to within 3% of a human player's inflation level.

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