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The Wyoming Challenge

Made to represent Wyoming as accurately as possible. You start in Cheyenne, the capital. Enemies come from Yellowstone National Park in the opposite corner.

Cities have scrap, population dense cities also have some copper.
Dark sand is used for locations with oil fields.
Coal is placed on top of active coal mines.
Water is water, but has some lead sprinkled around.
Top right has a single titanium and bottom left has a single thorium so you can get disassemblers going.

Survive Wave 200

Good luck...