It’s $20. It’s also a full PC strategy game, beautifully converted to iOS and touch. There are better bargains out there, to be sure, but there probably isn’t a turn-based strategy game as deep and impressive; it has invading aliens and a global squad-based war, but it unfolds with the brainy decision-making of Civilization. Gamers with a long vacation ahead, rejoice. Read our deeper impressions of XCOM here.