Perhaps you want to make a side-scrolling game but have no clue how to get started. Well, it's your lucky day because Replica Island is a very cool side-scrolling game that features none other than the little green robot that we know and love — the Android. Not only is it a popular free game on the Android Market, it's also completely open source and a great learning tool for game developers! This truly is a great example of a 2D game for the Android platform. Source code: http://code.google.com/p/replicaisland.