Games like Deus Ex and System Shock 2 are not easily labeled with genre tags. They occupy a strange middle ground in which elements of stealth, action and story are all blended together to varying degrees, though have a few common traits. Each game is designed to accommodate the unpredictability of player choice. The artificial intelligences that populate the worlds can be talked with, ignored, clubbed over the head, and generally dealt with in more interesting ways than simple first-person shooters would allow. Few playthroughs of identical content are exactly the same.