United Kingdom, Oct. 16 -- Rockstar Games cancelled its planned PlayStation-exclusive spy game Agent because multiple development teams failed to figure out how to make its open-world concept work properly.

Sony announced Agent at E3 2009, revealing a partnership with Rockstar for an ambitious spy thriller set in the 1970s, and the game was positioned as a major PlayStation exclusive, with Rockstar founders Sam and Dan Houser overseeing development.

However, Agent never received a release date and ultimately disappeared from view.

Speaking to IGN, Houser explained that Rockstar attempted to develop the game with "two or three different teams", but none could make the concept work.

"And it never came out. We concluded that it was not a...