Not Always 42 is a puzzle game where you must guess a number between 1 and 5. You can play alone or against other players. The game was created as a demo for my "Google Play Game Services" talk on Google DevFest Karlsruhe 2014. It currently supports Achievements, Leaderboards, Saved Games, Events/Quests and Turn-based Multiplayer.
The game is open source and on Github: https://github.com/dbaelz/NotAlways42