Right, that I do know. If you have any .ipa file and wish to install it on an iPhone or iPad you can do it with AltStore. It was developed by rileytestut as a way to install his Nintendo Emulator, Delta. It requires access to a PC or Mac, and every 7 days or before one must refresh the apps and AltStore itself, the computer works as a sort of server, so if you have the program on startup the iDevice will try to autorefresh itself in the background. And if you forget you can just reinstall AltStore and once you open it on your iDevice you will be able to refresh the expired apps. Here I have Delta and Flappy Bird, the latter being sideloaded since it's no longer on the AppStore. So it is possible to install games that aren't part of the Apple Aproved Catalog