Rainbird on 13 April 2009
http://playstation.joystiq.com/2009/04/13/pixeljunk-eden-encore-coming-this-week/
"The Encore expansion pack to PixelJunk Eden is coming this week. The upcoming DLC will add 5 new stages to the game, new Trophies, and will cost $5.99. According to the official site, this is a worldwide release, so everyone will be able to enjoy the game at the same time."
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Sweet! 
