The Swapper, a sci-fi puzzle video game, has you, and your clones, trying to find out what happened to a derelict space station. You start seeing those clones as more than just drones. Are they me? Are they alive? What happens when they disappear? Or when they die?
In-app purchases are the Holy Grail of revenue for app producers, especially those who make free gaming apps. The hook is that you love the game so much once you download it for free that you pay for access to new levels, weapons, tools, etc. This is only truer around the holidays, when app producers insert Halloween, Thanksgiving and Christmas-themed versions of their games to entice users.