There is no official "full version" release of developed natively for PC. The original game was released in 2011 as a prequel to the movie specifically for PlayStation 2 and PlayStation 3 .
There is a smaller, fan-developed 2D action game titled Ra.One : The Game by Satyam Anand available on . download-ra-one-the-game-free-for-pc-full-version
: This is a native Windows application made with Game Maker Studio. There is no official "full version" release of