Question 1

Is this a steam code or otherwise compatible with the steam version of XCOM?

Accepted Answer

I bought this retail version and it has a steam code in a small booklet inside.  It works with with my steam version of XCOM Enemy Unknown which is required to play Enemy Within.  Steam treats this expansion as an add-on or dlc, therefore Enemy Within won't show up in the steam game library list.

Question 2

Is XCOM: Enemy Within playable without the base game, XCOM: Enemy Unknown?

Accepted Answer

No, XCOM: Enemy Within requires XCOM: Enemy Unknown to play.

Question 3

What new features does XCOM: Enemy Within introduce compared to XCOM: Enemy Unknown?

Accepted Answer

XCOM: Enemy Within introduces new soldier abilities, new weapons and equipment, new enemy threats including two new alien classes, a new strategic resource called MELD, and new tactical challenges across an additional 47 maps. It also adds new multiplayer maps, units, and abilities.

Questions & Answers