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Miscellaneous Units refers to units in Age of Empires III that cannot be created nor seen in a campaign, skirmish, or multiplayer game.
They are hidden and certain units can only be accessed through the Scenario Editor. They include the Learicorn, Lazer Bear, Tommynator, and Fluffy. The Ice Cream Monster Truck also appears to be a miscellaneous unit. Cheat units are also considered miscellaneous units.