Sony doesn't want Vita flooded with ports like PSP

Sony is discouraging developers from porting console games to the PlayStation Vita so that it remains unique.

The company wants to avoid the mistakes made with the PSP, which was swamped with ports.

Sony's marketing vice president for handhelds and consoles, John Koller, outlined the problems of the PSP.

He told Gamasutra: "The issue that happened with PSP is we got overrun with ports. It became very difficult for us to define what made PSP unique.

"The content development became a bit unstructured or decentralised, in that we got a lot of content that was on PlayStation 2 and got thrown over to the handheld."

Koller wants to see more titles made especially for the handheld such as Assassin's Creed 3: Liberation and Call of Duty Black Ops: Declassifed.

He added: "The messaging is similar [between PSP and PS Vita], but I think the output is going to be quite different."