After buying Ouya from Amazon now the millon dollar issue is how to load games, apps, emulators, roms onto Ouya. After surfing the net for the same, I found a number of ways through which it could be done.
Creating an account in Dropbox.apk in your Ouya is one such way. Through your PC download the roms file in your PC. Open the dropbox account in your Ouya and export the files. In this way you can play your favourite games on Ouya.
A bit of work but worth doing it in order to play the games on big screen. For step by step details of the proceeder you can check the link.
There are other like AirDroid, Astro File Manager, Box.com, Easy Unrar Lite, ES File Explorer, ES Task Manager, Google Chrome, Kainy which could be used for sideloading the apps and games. Among them Dropbox seems to be best.
Apart from Dropbox, I found ES File Explorer also to be a good option. For more details and step by step procedure for sideloading you can check this link .
If one feels comfortable, Astro File Manager can also be tried. For more details about it follow the link given here.
Again while going through Ouya forums I found this guy’s post who manage to crack Google play through a software named Blackmart Alpha. According to him Temple Run and Star War worked great while no other Google stuff did well on Ouya.