Konami has claimed that Metal Gear Solid: Peace Walker will be PSP's "most complete game" when it is released later this month.
The title - which was recently awarded a 40/40 score in Japan games bible Famitsu - is due for release on May 28.
"We have good hopes for Peace Walker, which has been produced by Mr Kojima as the next full entry in the series," Konami UK marketing manager Rosemarie Dalton told industry site MCV.
"It is probably the most complete PSP title for the format, using the various capabilities of the hardware, built within a stunning game engine that brings all the story-telling, aesthetic prowess and action set-pieces that Mr Kojima is famed for.
"Peace Walker is the definitive MGS title for PSP and doesn't hold back just because it is on a handheld."
Creator Hideo Kojima last month questioned whether the humble home console would have a future - as 'play anywhere' Cloud gaming took over.