Yep, it's an Amazon.com exclusive game for now, to promote their new app store. If you update the amazon.com app that comes in nitdroid 0.10 it'll have a link to install the amazon app store. You need an Amazon account and probably only works in certain countries. But once you install it, you can "buy" Angry Birds Rio for $0.00. http://www.amazon.com/Rovio-Mobile-A.../dp/B004SBS8LA