Joining the Forza Horizon demo onto the marketplace today is another demo, this time for XCOM: Enemy Unknown. 

In this two level demo from the single player tutorial campaign you will experience both the tactical and strategic layers of the game. You will be introduced to the XCOM base where you will train your soldiers and engage in the research of alien technology and the tutorial missions will guide you through combat controls and effective tactics for dealing with the alien threat.

Let us know your thoughts on the demo in a comment below.