XCOM sets the standard as to what to expect in turn based strategy gaming. Players use soldiers to fight off an alien invasion by utilizing cover, flanking and other strategy tactics to defeat the alien baddies on each level of grid based environments.

For a series that is regarded as hardcore gaming even on PC, to see this franchise come to mobile is a godsend.

The gaming genre of turn based strategy lends itself very well to touch screen devices. It is actually easier to interact with the characters on screen with ones fingers instead of a mouse.

Enemy Within is and expansion on the clasic Enemy Unknown. With Enemy Withing players are given new options such as maps, missions, enemies and of course the new Mech Suits.

There is a new resource known as Meld that allows the user to purchase upgrades that has been added to Enemy Within that was not in Enemy Unknown.

The choices the player makes from what kind of upgrades to use to what soldier to send where on a battle map will effect later game play.