AoE III D.E. overall is a vast: improvement and update, of AoE III.
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Diverse game menu options covering various game modes, colonial historicity, game indexes, newer maps, reduced difficulty levels from easy to hard.
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Improved in-gameplay options and graphics design, visuals and graphics quality, new settings options, some infastructural and unit mechanism changes.
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Diverse improvements and unique changes in Native, Asian factional gampelays.
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Newer unique factions like the Swedes, Americans and Mexicans and the Africans.
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Though not gone through but the battle section is awesome other then older campagins remastered into one D.E. version.