What is the difference between Enemy Unknown and Enemy Within?

Question

Enemy Within added a number of new maps, at the time much was made about the maps having more elevated positions so you got more of a 3d feeling to combat. There were a couple of maps that were removed. Two new mechanical aliens were added.

Hagrid P Hazard · Accepted Answer

Enemy Within added a number of new maps, at the time much was made about the maps having more elevated positions so you got more of a 3d feeling to combat. There were a couple of maps that were removed. Two new mechanical aliens were added.

What is the difference between Enemy Unknown and Enemy Within?

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