Sony has announced it is to invest $20 million in its Pub Fund to develop PSN exclusive games.

Originally announced at GDC 09, the Pub Fund program provides “additional development budget for developers who create innovative, exclusive titles for PlayStation Network,” said Sony in the press release.

SCEA helps with game design and marketing plans but allows the developer to own the game’s intellectual property, publish the title and set the price.

The first game developed and released under this model was Burn, Zombie, Burn. Due to the “great success” the service has achieved with titles like the former along with Joe Danger, Critter Crunch, Flower and the PixelJunk series, Sony plans to add “new and different game experiences to this portfolio of games that can’t be found on any other game console.”

According to Brandon Stander, PSN’s director of marketing, “this investment includes support across both our own network of first-party studios as well as for the Pub Fund, which was first introduced at GDC in 2009,” he said over on the US PS Blog.

“Under this investment, we’re committed to delivering titles that have innovative gameplay mechanics, vibrant visuals, interesting storylines and an artistic element to interactive entertainment that can only be found on PlayStation Network,” said Stander.

Sony said this investment will bring more “unique, fun, innovative, edgy and higher quality game experiences,” to the PSN service, with plenty of titles being offered as part of this three-year plan.

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Announced titles include: Eufloria, Okabu, PAYDAY: The Heist, and Papo & Yo.