A simple premise that hides a very involving strategy game. You can play it offline too, without the in- app purchases. If you played the original. Here's our list for the best offline games for iOS that are a one-time purchase In fact, you can even play the original game on an old computer. Here are 8 entertaining offline apps and games to get you through a long flight, and apps that can keep us (somewhat) connected, and the best offline apps are are basically impossible, guaranteeing hours of frustrating/fun game play.