To earn prizes, you must earn coins.
You can earn coins multiple ways:
Play achievement games
Complete high paying tasks
Complete free or paid offers
Here's the link: http://www.tremorgames.com/?ref=51940
Games and DLC's that I have already earned on the website: http://gyazo.com/1cf...8e69e8ff1162c60
More proof: http://gyazo.com/840...24a8b295824847a