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I try to make all my games work on iOS devices that support iOS version 9 and above.
For Android, I try to work with any device that works on Android version 4.4 and above.
No, you don't.
However, I utilize GameCenter and Google Play for added features, and signing in can make the game play more enjoyable.
Gamers like achievements and leader boards, so that is how I implement them.
It was just an excitement with some new technology that is only available on Android.
Maybe. If you've got a fun idea, talk to me.
Some are, some aren't. Often I find myself learning something which results in a game that may be considered unoriginal and not new. If I go through the process of making the game and it works, I might as well release it.